"It just works" isnt that accurate. Personally speaking, I recently upgraded from 14.04 to 16.04 ubuntu on my desktop only to have it stuck in some strange errors. 16.04 network manager is also quite a nuisance. On some networks it only provides a few http calls and drops everything else.

I still exclusively use linux os on all my computers because I am do ised to it now. Perhaps just ubuntu is poor quality nowadays (at least with 16.04) but linux desktop still has some ways to go