NixOS is the best operating system I absolutely cannot recommend to anyone - Anurag Singh
(www.xda-developers.com)
Personally, i dream of a stateless, tag/attribute-based, tree-less operating system. "directories" would not be neccessary but a tag could be displayed as one in file managers. Want to load a library? type:library, name:xyz it is.
Stuff is there on the disk anyway, you just have to identify it.
But that would require the whole system and the tooling made for this.
But maybe we get there; since the young generation isn't used to file trees anymore.
Edit: ok, scratch the kernel, it could work.