> Systemd could completely eliminate the need for stuff like docker by totally isolating a process.
It does: nspawn is much leaner than docker and it's available on all Linux systems with SystemD.
This literally made me laugh out loud.
Over the years I have historically had several production system outages due to journald corrupting its own data store, being unable to log, and services hanging due to being unable to log (process stdout buffer full, journald not reading it, so process stuck trying to write output).
It certainly has improved over the years, and it has been a long time since this issue has happened (on one of the systems I manage at least), but I have accrued some pretty deep seated feelings about it at this point due to historical pain.