There is a whole questline with cutscenes and stuff for each and every encounter. No idea why you think they have no meaning.
FFXIV not having trash in their end-game raids in which you will wipe 80-100 times is like the best thing ever.
Just look at Sanctum of Domination, if you don't rezstone a healer you have to walk for like 2-4 flipping minutes.
Not to mention about waiting another minute or so until everyone is ready.
In FFXIV I wipe and instantly start the pull timer again.
If WoW would just set the respawn right in front of the boss room you are currently trying, most people wouldn't complain, but for some dumb reason, they never -well, rarely (i.e. Sylvanas), do.