Even, if there would be no practica reasons to delete the LFR, there's still the idea of MMO aspect here.
The idea of finding group to go together and kill some raid bosses is the most socializing aspect in PvE. LFR had to be socializing, just like other tools that made finding group way easier - but in fact, it's absolutely the opposite.
I have never liked LFR, and I have always been the enemy of it. But now that I played Classic for a while, boy oh boy, that's what I miss.
Nevertheless, there are countless practical reasons to delete the LFR, like LFR is making the raid gear less rewarding. 50% afk and after the kill they trade the loot with those who do not need it. After completing the entire raid, they have a full set of gear.
I wonder how it is possible that people still discuss this topic. LFR, LFD and quest tracking are the cancer that killed this game and made players both toxic and lazy, at least the way these work today.
I have nothing against QoL changes, but these systems ruined the core of this game.