The only reason why I do LFR and raiding nowadays is in order to for me to see the content while also gearing up so that I can do some more soloing of old raids. Soloing has been the only thing I've considered 'fun' the last couple of years. When I stopped hardcore raiding, I were unable to find the joy I once had. It pleases me to take down a boss that I once considered impossible. It is fun. LFR? It's not really fun, it is more of 'to be done' kind of thing.
There are far more stuff that has 'killed' WoW for me, LFR is part of it, but surely not the only reason. The community is dead. That is the reason as to why I'm unable to find the joy I once had. Do I want to do a dungeon? Sign up. Raid? Sign up. Pvp? Sign up. There is no incentive for me to ever talk to anyone or organize something. That incentive was a major part of the game back in Vanilla/TBC when you had to actively look for members for heroics/raids/pvp (not that much in pvp, but still more than today).
LFR is a grind. I would rather have the increasing buff than a group that falls apart after one wipe.