Yet Linux worked perfectly for me and many people/offices I migrated to it (they didn't need any Windows-only apps) during the recent decade. Since about half that time Windows and Mac users don't even have to learn nor tolerate anything - everything is familiar (today users of Ubuntu should better learn GNOME3 workspaces though but that's not necessary) and eye-candy.

So I really have zero idea of what problems might he mean. Besides lack of native Photoshop and Visual Studio the only thing which always annoyed me in desktop Linux were NumLock quirks. There was also a problem with games but apparently it's not the case any more.