> If it's time to stop using windows, all those windows users will have to relearn everything either way.

No, that's the thing; they ideally would only need to replace the OS. Many long years ago, when I switched from Windows to Ubuntu (this was back when it was good), part of why it was so easy is because I mostly kept the same applications. If you use eg. Firefox, VLC, open/libreoffice, audacity, etc., then you can install a new OS, reinstall the same applications, and barely have to change anything. That's huge.