Sometimes, I feel like the average Linux user is just on very old or at the very least pretty old hardware.
I know I am probably wrong, but it just seems odd that in X11 my 8 year old ultrawide 144hz 1080p monitor is literally a stuttery and jittery mess when moving windows, when animations play, and even moving the cursor around. I believe I tried playing a game, and it also being a stuttery mess, but I can't remember as that was around 6-7 months ago.
Using Wayland, on the other hand, as soon as I logged in for the first time it was definitely noticeably NOT like it was in X11. Frame rate was 144hz, everything mentioned above just worked as I would expect. It even feels smoother than Windows which I still have to use every now and then. Gaming on it is a blast 99% of the time, and I game A LOT! (completed ~10 games on openSUSE Tumbleweed just this year!)
So, sometimes I just feel like I said, and as I also said, I'm probably wrong. I have never logged back into X11 except when I upgraded my graphics card a month or so ago because of the stuttery feeling of X11. Some things did work better under X11, I guess, but that is probably because of the stagnant adoption of Wayland?
Besides me using Linux since the beginning of this year until now, I am still a Linux noob, so my opinions are just that. I have no real knowledge of Linux that would qualify me to be any good source of info. I just don't get the slow adoption is all!