Let's say I install Small Basic on Windows 8.1 or 10. So now I've put my kid in front of an operating system that has such a high-level UI that it doesn't even have a proper list of programs. The media consuming portion of the OS is so heavily emphasized over the creative portion of it. You can see this because the OS is designed to be used without a keyboard!!
PCs are entertainment devices. Designed for watching Netflix, visiting Facebook and listening to music. This is like putting a small piece of Broccoli in the middle of a bowl of ice cream.
No thanks!!
I'll find a minimal windows manager for linux. Something that can be invoked just to get the window for the game they're writing up and running.