I was about to say, I’ve only come across that particular issue since moving to KDE, but I know what you mean about the lack of options, but then I looked in the settings, and found this:

It’s getting there!

That’s exactly why. You can manage users no problem. Multiple machines was never the paradigm.

90% of the current development effort (containers, virtualization) is about copying the working machine and giving it a nice safe space to run in, where no outside forces can reach in and disturb its peace.

Did you just try to theme my app? We’re opinionated software, and that’s bigotry.