You’re forgetting the most important con of all (to the people who are against it) - they think it’ll hurt them in some way. What way? They can’t explain. They just think it’ll hurt them.
The same people always respond “You just want another main” or “Essences don’t take as long as you act like they do” - yes, yes they do.
To them: Try doing raid essences, many of which are best in slot on a toon you aren’t doing heroic/mythic on, so you get the essences VERY slow. They will take months. Thus, you will need them even in M+ (WHICH IS NOT A “SECOND MAIN,” you do M+ on alts even casually, but if you want to do any remotely high keys, you need the better essences, period.) On top of this, Eternal Palace will be old content in 8.3 once the new raid drops, so we’re supposed to grind old content raids for essences for months?
Even if they drop the rep requirement for Mechagon to Revered, their essence is still best in slot for healing, because it turns overhealing into viable healing. And unless you do every single daily every single day, that’s well over a month of dailies, you can cut it down if you do the daily every single day, but most people are not going to, as they have lives.
That’s just two essences, there’s many more that are worse. Like the Nazjatar Bodyguard Daily, etc.
Then there’s people like the OP who actively play more than one toon FOR THEIR GUILD RAID TEAM.
I agree with the OP, as anyone who knows my posts about this know.
Account Wide essences are needed, period. No one has given an actual argument as to why they should not be in the game. They only give bad excuses like “Stop being lazy” (which is not the reason, and I should just start flagging the posts because they’re insulting the people) or the reasons listed above.