It's also increasingly painful to make happen in today's email ecosystem.
The restartable kernel stuff is really cool. Starting to have userland things that systems can persist across soft-boots (user fd stores) into new kernels is a sweet capability. Excellent to have common machinery to help with that.
As always some really sweet good new security / partitioning tools. Amazing superpowers that continue to build and grow.
Btw, it already exists and its called ParticalOS:
When it stops being applicable, which given the tendencies of the SystemD developers, does not appear to be any time soon.
So they're just doing their own thing, and the distro landscape seems a clear indication that their own thing looks pretty compelling to basically every distro with any meaningful market share.
People may as well make the pitch that Linux is "taking over everything".