Even Windows is the right choice for lots of people. For example, if you want to play some new game, chances are it will work best on a Windows machine with a monster GPU.

I agree with you though - all of the modern OS’s are mostly good enough and have been for quite a while. It feels like a solved problem.

The person who wrote the comment on Reddit may love KDE, but that doesn’t really matter if they need to run XCode. Application requirements drive OS choices and the OS may dictate the hardware.