Isolate the init system? Really? and start up how exactly? Or do you really mean REPLACE not isolate.
This sounds more like an old hate on systemd type post, I thought we were over that, what, go back to an older init system? Really bad idea, systemd is light years better now, sure it has issues here and there, and networkd is still crap, but going backwards isn’t a solution.
Just checked, you brought this up a few weeks ago (here) here we go again.