What would you differently, if you could redesign Linux userland from scratch?

Prompted from a similar discussion at lobsters (and i am copying the text verbatim)

If we kept Linux the kernel exactly as it is today, but redesigned everything in userland from scratch (the init system, the filesystem hierarchy, the shell, libc, packaging, configuration, dbus, polkit, PAM, etc.), what would you do differently, and why?

here is the link to the original lobsters post: https://lobste.rs/s/ko5i9y/if_you_could_redesign_linux_userland_from