The thing is, there is absolutely no reason the game cannot be designed to fulfill both types of play styles. Except for one nagging little detail: to do so would eat just enough into profits that Blizzard would lose a few $100k profits quarterly.
To employ quality staff to design, develop, and maintain such a game vs attracting short term stock purchases. 
It wasnāt to make it easier it was so other people could literally pick a node because bots were so bad in panda / wod you couldnāt pick stuff sometimes.
Do like FFXIV did and just make them personal tap nodes then the discourage multiboxing part wouldnāt be necessary because itās not needed. It would be just as much as you could farm and you see the other person farming / picking.
So if bots were going around, you could still see them picking and still see them going in routes to report like it is now. You wouldnāt have people fighting over nodes.
Proper game design in the first place would have fixed the whole multiboxing issue before it was even brought around with multitap nodes in legion.
Good times 
Standing on ore fighting a mob so people know you intend to gather it, them gathering it while youāre fighting the mob and then the inevitable argument that would come.
10/charā¦
If you ever went out and farmed mats among other people it would.
I guess the overall point that I am trying to make is that those of us that are interested in bettering the community but just happen to like a particular style of game play would be open to changes that made game play more enjoyable for both types of players involved. And if that for some reason was not possible. Create one server where it is allowed. See how it goes. Where is the harm in that. I mean at this point there is a server for everything esle. Classic, TBC, Retail, You talking 3-6 servers. I can guarantee there would be non multiboxers that played on those servers as well. Why not embrace a different style of game play.
You want my honest, personal answer?
If it succeeds then the game designers have to admit failure, that they were wrong.
Remember You think you do but you donāt?
There could be other, more tangible reasons. But I wager first and foremost, the first obstacle to any change is an unwillingness to put themselves in another position where they are proven wrong by the consumer base.
I have farmed for mats plenty. And did so for years as a solo player. I managed to use them to benefit my characters. Just like most solo players do. The only thing that changed for me when I started Multiboxing was that I then needed 5x the number of mats. Never once did I attempt to crash and economy.
Oh boy! Do I remember? Like it was yesterday.
Paragraphs are your friend, unless you wanted to turn people off reading what you have to say.
My opinion on it is that mboxing was taken advantage of by a few bad players who enjoyed disrupting the game for others. You cannot tell me that someone running a mbox set up of 60 characters is doing it for simple gaming use. They are doing it to cause zone disruptions and mess with other peopleās gametime (which they pay for).
Its unfortunate that the innocent got swept up with the guilty. I doubt Blizzard liked people cancelling extra accounts but they had to do something, and they chose the lesser course, by saying you can still have multiple accounts, you just cant use a specific software to facilitate it. Other games have banned mboxing outright, which Blizzard hasnāt done.
Simple solution to that is limit the number of accounts that could be controlled to lets say 10. That way you can experience all content. And to that end yes 2 Multiboxers might have to team up with each-other if they want to run 20M content, and so forth. Or 1 Multiboxer and 10 other players. IMO I just never saw the down side at it has been described by others. Or even make it 8. Since that is the number of accounts they allow per bnet email address.
Most boxxers agree that something should have been done or needed to be done but feel as I stated before this was complete shift in stance and could have been handled much differently.
And I added paragraphs to OP now. 
So that would mean two players would be able to cause the disruption previously cause by one. If the ability to use input broadcasting software supported a disruptive activity, the only way to stop that is to remove the cause.
People can still multibox by doing it manually if their purpose is too just control a couple of accounts for a bit of farming or solo play. Sometimes the few have to put up the inconvenience for the good of the health of the game.
Yeah I guess in the same way that a streamer can get 120 individual players to wreak havoc on a zoneā¦ But in that instance it is okay right? It isnāt right in either circumstance.
And you never had to compete for nodes? Because whereas some saw that as fun, many found it tedious and frustrating. So they added multi-tap nodes so that people didnāt miss a node because they got in combat or because they happen to be just behind 3 other people farming the same area.
Sure, I have missed out on some gathering nodes. But then again this is the whole premise of the post I made. Pendulums are going to swing but they often swing too far. If you miss out on a node because someone else picked it up then fly, run, stealth by them and pick the node in front of them. Or stand there wait for it to spawn again. kill an npc in the mean time. Farm something different. I mean there are so many other options than to just follow another player and watch them pick herbs or mine ore. Head to a cave, farm something different and then sell what you farmed and buy what they are selling. Here is a Thought for the Devās. Make node spawns random and when I say random I mean like I should be able to tell you what zone you can find the mats in but not where they are going to be. In a chest, when you kill a mob, an actual node spawn. There is much more that can be done then just say oh well that player got there before me. In addition to that 10x tapping? Like I said before there are many ways to make adjustments that benefit everyone.
personal nodes just for you would fix that to where no one else can take it i remember nazjatar and the simplest solution was find the guy with 7 and follow him around cause it taps out at 10 or turn wm on or off.
Putting all the needed herbs in one zone for 2 patches also didnt help instead of it becoming available in uldum or vale in some capacity later or having more spawn points.
Again better game design would fix it before it got to the point it did!
Heck no! Multiboxing is simply griefing and cheating.
The game is built around playing one toon at a time and needs to stay that way.
If you want to control a whole time go play Baldurs gate, itās designed that way.
Ok, so you do see how it benefits single players to have multi tap nodes then. But every alternative you posted doesnāt actually provide the same benefit, they are just methods to compete which already existed. The point was to alleviate the competition to create less frustrating gameplay.
Anyway, you can still multibox. If the point is that you enjoy the challenge of it, then Blizzard has said āgame onā, do it without automation or broadcasting.
And lo and behold, they improved the game design on a fundamental level by changing their policies.
the people who define what is and is not cheating (blizzard) do not agree with you. get over it.