Distros are not dropping Xwayland, just say "run our app trough xwayland". Recommending X11 distros or compositors is not good advice. X11 on its own is dead, and things like KDE do very little development on their X11 version.
Some if not most of these bugs are 100% application bugs, very few actually used wayland compositors have performance bugs for example (but your app running in wayland native might).
With what a dumpster fire X11 has been lately its a bit weird to bet on it for your application.
Technically if you power a laser shooting into space with solar panels you are cooling the planet, but you are ofcourse right in practice and on the scale of the universe!
The app is a competitor to google drive (app). It is used to upload/download, backup, syncronize (one or two way) files, media and documents between the device and the cloud. Doesn't that cover more than one of the mentioned uses? Why would FilesyncPro (example) get to have the permission but not nextcloud client? Even for media files specifically there are a lot of gotchas without full file access, like risk of location being stripped from all images synced trough the app (unless user gives media location permission) or similarly missing exif.. To upload on change it needs to be allowed to watch the filesystem
Meanwhile google drive gets to be installed as a system app
Some if not most of these bugs are 100% application bugs, very few actually used wayland compositors have performance bugs for example (but your app running in wayland native might).
With what a dumpster fire X11 has been lately its a bit weird to bet on it for your application.