No, stutterstep jank is unique to FFXIV. When I say 'casts', I mean pretty much any action taken by a mob, irrespective of whether it's a spell or not. This is how it gets described in the in-game text combat log. If you take a mob and start backpedaling, it has to stop the instant it tries to do anything to you, auto-attacks included. Once the "cast" starts, it's effectively locked on. Even abilities that are supposed to be "instant" cause a stutter, because the boss has to be briefly stationary for their activation. This is also why that embarrassingly bad spin-to-win bug is even a thing.

LOS works in FFXIV as well. That's a good thing. Otherwise you need a 'draw in' effect to group up casters.

Responsive mobs allow for more complex positioning mechanics. You have to be able to 'pilot' them around the arena to reposition your team out of mechanics. If. The. Boss. Stops. Every. Two. Seconds. For. An. Auto. Attack. This. Doesn't. Work. Out. So. Well. There have been some valiant attempts (A7S). But FFXIV has largely just given up since Stormblood and made the bosses move for you. So now you're a lower damage output melee dps that occasionally eats a tankbuster with an invuln. Ye olde 'Move boss out of permanent puddles that gradually shrink down the arena' is pretty much a primary school level tank check, and yet FFXIV is utterly scared of that sort of fight mechanic because it highlights the m-m-m-m-m-movement jank so badly. Warcraft doesn't need to design brilliantly creative fights to outshine fights on rails with pre-programmed boss movement and timestamp locked abilities. They just need to design minimally competent ones.

I don't think that every tank needs to be able to clear every fight. I know that paying customers are entitled to raid glamours, much like paying customers are entitled to mogstation stuff. But that's what difficulty settings are for. Let glamours come out of the easiest difficulty setting. It's okay for a raid wipe to happen because a tank fails to position or mitigate appropriately. If it's too hard, just pick an easier difficulty setting. Let everyone be able to find a difficulty level that suitably challenges them.