Linux has, because of legacy reasons, a more complex than required clipboard concept. Because of this, different apps may use it in different ways, and have unexpected behaviors. Some applications (I think, but not sure, Libreoffice) may lose the clipboard content when closed. The very fact that one needs clipboard managers to workaround the base clipboard behavior is proof that Linux's clipboard implementation is not working (from a user perspective). And beware that clipboard managers may have unintended security issues (I'm positive some do), ie. storing user data on disk (copying confidential information to the clipboard is inevitable, and you do the maths).
Bluetooth has been historically broken. Bluez has been poorly implementend and documented. Here's an old post: http://www.bennybottema.com/2010/08/08/how-ubuntus-broken-bl...; it's old, but the situation has been bad for a very long time. As of Jul/2022, at least some (potentially all) Ubuntu distros ship with a broken pulseaudio/bluetooth configuration by default; a bug has been opened for a couple of years, and has been ignored by Canonical.
File managers depend on the graphic toolkits used. Applications that use different toolkits will display different file managers, and for example, they won't share bookmarks. This means that you open an application and bookmark a directory, then other applications, and the bookmark is not displayed.
> Use Wayland for GUI apps. Use more cli applications.
Telling the user to change applications because of problems of the operating system is nonsensical.