It hasn't been as common for a while, but I remember using a litestep ui in the win2k era... actually like the Windows 7 desktop/menu/toolbar interface a lot.
Beyond the UI on top of the underlying OS... I'd say that most software development is business processes, which can be handled in pretty much any operating system and higher level language on modern hardware/software that costs a lot less than the time used to develop said software. Yes, performance matters. Yes, there is a need for open platforms. However, good enough gets the job done most of the time.
I mention this as someone who really doesn't want to deal with the underlying hardware any more than I need to. I have no interest in writing or debugging drivers or system libraries. I do like writing useful, and sometimes not so useful things on top of other tools. If I can do that in node.js, c#, go or other languages that makes me happy. It also makes me frustrated when I need to do something in Windows that's far easier in Linux.
That's a bit harsh. The point of OS is to provide a computational platform for higher level computational stuff like arts and science. It would be a dark world if everyone just tinkered with OS kernels (while it sure is nice some people do).
Really, we shouldn't encourage kids to waste their time on operating systems whose developers are hacker-hostile.