Until you upgrade the kernel and your wifi stops working. Or the desktop stops loading and you have to spend time going through logs and googling what's broken this time. Or when you plug it to a secondary screen and it freezes. This happened when I was a desktop Linux user and this still happens (less frequently nowadays though). I'm mainly talking about Ubuntu which is supposed to be beginner-friendly and not some obscure distro.

When I was younger I was very happy to deal with these issues because I learned a lot and probably made me the professional I am nowadays. Over time however I realized much of this knowledge doesn't contribute to my day-to-day work anymore and it's just an annoyance - I now want to turn on my laptop and work right away.