Each user will have their own gripes. Personally, for me, unity 7 was peak desktop. Since both unity and X are abandoned, it is increasingly difficult to get fixes for bugs. So, we need to switch to wayland, which fixes some issues like screen tearing, but things like multi-monitor setup are still quite flaky. And finally, GNOME is just not to my liking. So I would have to wait for KDE or XFCE to sufficiently catch up with wayland. The packaging situation has also become worse. There isn't a single LTS distro doing a good job of packaging chromium.