I wouldn't call that a re-invention UNIX as much as a serendipitous streamlining of it. At the rate features are being added to Linux, I wonder how long before it collapses under its own weight, and these passion projects like plan9, serenity os, redox, etc. take center-stage to pick up the pieces.
Just because those who don't understand UNIX are doomed to reinvent it doesn't mean that those who do understand UNIX aren't also doomed to reinvent it.
None. Being explicit about the files I'm deleting tends to make me think about what I'm actually doing. Hacking in a windows-style garbage folder isn't exactly difficult either.