They hate us gearing up for current game content, and they hate us trying to optimize running older stuff.
A big issue with legacy content is how much Blizzard goes out of their way to make it worse to run every 1-2 expansions. People were soloing Legion stuff in BFA, and while there IS legacy scaling in place for that content, I somewhat agree that it should’ve been stronger, or more changes to fights that were otherwise impossible to solo. It’s not that some of the content was challenging–it was straight up impossible. This is a common complaint, and though it’s all easily doable with a single other person, I do sympathize.
Even more recently is nerfs to mobility in older content. This is a more black and white example, since this was Blizzard going out of their way to nerf it. You guys saw the Runeblade of Baron Rivendare nerf, but unfortunately they silently nerfed my Sprinter’s Sword. I had worked up to about 163% movement speed for my legacy transmog farming, but evidently we can’t have nice things for that. Y’know, despite the fact that there’s chars out there running around with 200-220% movement speed unbuffed. The idea that you’re not allowed to do irrelevant content quickly–especially given the RNG drop of transmog and mounts–is very telling. Players have, for years, setup a way to skip to the final bosses for mount and transmog attempts on alts, such as Garrosh, Yogg-Saron, Illidan, and The Lich King, but screw you if you were going to run the whole instance.
A much older example of Blizzard hating legacy content is merging Ulduar’s drop tables. Were you just missing one piece of a tier set, and needed to run Ulduar 10 man maybe a couple more times to get it? Not anymore, comrade. Now the tables are merged and your chances of getting that specific item were lowered.
And there’s also the change to unify lockouts entirely for the raids. Gone are the days when all four instances of Icecrown Citadel were separated as 10 man normal/heroic, and 25 normal/heroic. It took me eons to get all the shield transmogs out of there because of this change, since Sindragosa 10 man only drops 2 items at a time, and you can easily get doubles. Each time I went in there meant I was waiting another week, and sacrificing a run at Invincible. What was the reason for this? Legacy vendor gold farming? That makes zero sense, since that was never a good way to make gold, except that one short while when Cataclysm raids (mainly Firelands) were dropping too much.
So, why does Blizzard hate us running legacy content? What is the reason for it? I’m not even talking about the Timewalking EXP nerf that just happened, since that was clearly a bug (and also since TW dungeons are still the fastest 50-60 leveling method). However, Timewalking counts here, since Blizzard has never bug fixed it, and scaling is all over the place. Anyone that’s run the raids knows how bad it really is. (BT is appropriate, but Ulduar and Firelands have broken tuning and are stuffed full of bugs–some of which are game breaking. Illidari Council door doesn’t always open, friendly fire on Flame Leviathan can delete allied vehicles in seconds, and Beth’tilac famously doesn’t even function at all.)
Addendum: I forgot to mention how some old reputation-gated things are horrible. Why are BFA reps so unbelievably bad to grind compared to Legion? And even running around Legion to still do their crap for paragon cache goodies is crap. I’ve been farming The Warden’s reputation for Sira’s Extra Cloak off and on for years now, and I keep my wowhead post updated every month or two to track how unlucky I’ve been. I do the emissaries for The Wardens and Kirin Tor, and occasionally a few extra quests, having long ago burned out from clearing out all WQs for The Wardens rep ages ago. But I also want something from one of the BFA reps, but I can’t be bothered to grind out the drip feed of reputation you get from everything in that God-forsaken expansion.