Future raid levels like T4 and A2.

How many people feel kinda turned off by these levels where you just have waves of trash thrown at you.

A level can have trash, sure thats fine, but when the entire level is just trash followed by more trash, then it gets kind of boring.
Especially when there are so many waves. We are working out the positioning for wave 7, which requires us to at this point mindlessly grind through our already well practiced motions on waves 1 through 6.

Well I just described any boss with phases didnt I?
The difference is, on a boss there are typically some interesting mechanics, some strategy to counter them, etc. On these "trash boss fights" (from a tank perspective) it is "run to where mobs will spawn, use aoe hate generator to grab mobs, run mobs to group hoping nobody tabs and rips aggro off by bursting the wrong thing, wait for mobs to be CC'd, do meager tank dps... repeat".

Its worse when you are working on the last few waves, as now you literally just go through the motions to get there, spending some 6-8 minutes every time... Im not really keeping track, Im too busy running around gathering mobs.
The one kinda decent part is the Widows, who have at least some kind of mechanic that requires the tank to pay attention after the initial positioning.

I imagine the idea behind these levels is to create a large target density so people can use their aoes for a change. This can be accomplished by adding a phase where the boss gains sub-targets, like in Qarn Hard. So you can keep the boss-fight feeling and mechanics, while still giving aoe a place in the fight.

Better than T3 though.

I think having something different than our usual fights that always ends with a boss is something good and adds to gaming experience. T4 when it got released was not easy and people had to develop some sort of tactics on positioning and other stuff. I might agree on A2 being unsuitable for a raid (I have no experience in A2S so I leave it to those who has done it) since there is no pressure on players to position mobs but I prefer to have it over a normal boss fight.

Better way to do this would to simply have a boss rush kinda feel like t2. Fighting trash no matter how hard you make it is just fighting trash as a tank picking up waves of adds gets mind numbing and a bother after a few runs. Camp the spawn, aoe, pop a cd, aoe some more help burn the guy with the debuff.