For example, i cannot stand vsync anywhere with the only exception being video playback. I want my windows to follow the mouse precisely, not lag behind a few pixels, i want my games to react instantly, not lag a few milliseconds, etc. Yet GNOME, elementaryOS and even Wayland's whole design force it (well, Wayland could be implemented without vsync, but is anyone doing it?).
At the same time you have people complaining about tearing and when they force composition everywhere to fix it, they do not mind (or sometimes, even notice) the lag.
Similarly, i like how X allows composing applications and environments out of individual components (ironically this sort of application composition lends itself to the Unix idea of one app per role, but most modern toolkits ignore that feature so we ended up with almost nothing really supporting it unless you go raw Xlib or ancient toolkits like Xaw or Motif).
Others see it as anathema and the root of all evil (ok, i cannot put some more concrete negatives for this as i cannot comprehend how someone would dislike it, yet i always end up arguing with people - especially GNOME/Gtk+ people /for some reason/ - over at Reddit about it :-P).
There is no way to please everyone, so you have to allow for choices. Or deal with people constantly complaining about their lost choices, that works too i suppose :-P.
