You missed out the part "why would they do any of this". You can't just list the things Linux manages to do regardless of their unified tree, you got to explain

You missed out the part "why would they do any of this". You can't just list the things Linux manages to do regardless of their unified tree, you got to explain the benefits. I think it's a perfectly fine distinction to make, and having devices always mount at the root seems a very reasonable restriction that actually helps novice users. One could of course also argue that the unified tree is merely an artifact of having to store all kinds of OS information as files in that same tree, when they are not really actual files...