Problem is, people don't react well when convenience is removed. I heard there was a massive outcry when they removed a lot of portals in the game for example. On the other hand LFD is basically not relevant at max level thanks to M+. However, M+ has also made raiding much less lucrative. And let's be real, the added complexity over the years has in several cases made raiding far less fun. Not saying we should go back to simple bosses but there is a middle ground to be found. A much stricter limit on raid addons would be nice as well, because the arms race between addons and boss designers has been going on for years now, it's gotten pretty ridiculous. And yes pve rotations in Classic are very very simple, in large part due to the debuff limit. In pvp however you get to use most of your toolkit on a regular basis. Also, it's not the gameplay that will keep you playing Classic, it's the people you meet.