As someone who grew up running Microsoft OSes, starting with DOS, then Windows and who has used a Mac laptop since the Windows Vista days, my perspective on the usability of Linux Desktop is unrelated to it simply being "different from what I'm used to."

Transitioning from Windows to Mac was much more of an adjustment than Linux Desktop. It's just that Linux has too many rough edges. While it's possible I've simply been unlucky, everytime I've tried Linux it's been small niggling issue after small niggling issue that I have to work around and it feels like a death of a thousand paper cuts. (BTW I first tried Linux desktop back in the late 90s and most recently used it as my main work laptop for 9 months this past year.)

Note, I'm more than happy to use Linux as a server. I run Linux servers at home and have for decades. But the desktop environments I've tried have all been irksome.

Note that I'm not mentioning particular distros or desktop environments because I've tried various over the years.