the issue with them not releasing things till later because they can see whats annoying and whats not is that they still dont change anything even though its been asked for for years.

Example, Tol dagor with Sanguine. No one enjoys running it, even in the MDI people skip it because its pure cancer to deal with. Alot of mobs are immobile and like to just stand there unless you LoS them. Yes, you would kill those over the other mobs, problem is that most classes have either passive cleave or its a massive part of their rotation to not use only to single target something down. Example, peacekeepers in mechagon / sniper mobs in siege. tempests in temple.

Sanguine in and of itself isnt the issue, the issue is that some mobs just dont move unless you position them in to a location where you can LoS them or wait for their channeling skill to be used so you can then kill the mobs around them to move the big hp mob.

Saying you'd prefer bursting over sanguine, just tells me you dont really do all that many keys.