I’ll just go ahead and start the flame war.
I totally agree with the functionality of systemd. We need that. But the implementation… Why the fuck do we need to cram everything into pid 1? At least delegate the parsing into another process, god damn. And could we all just agree that ’systemd-{networkd,resolved,homed}’ don’t really have a reason to exist, and definitely not that coupled to a fucking init system. Systemd-timers are wonderful, but why are we running cron-but-better in pid 1?
We have an init-system where the developers are afraid of using things like processes and separation of privileges. I’m just tired of patching fleets of servers in panic every time Pöttering’s bad design decisions hit the fan with their CVEs and consequences.
Your numbers are old. If you are building today with anyone ad much as mentioning AI, you might as well consider 100kW/rack as ”normal”. An off-the-shelf CPU today runs at 500W, and you usually have two of them per server, along with memory, storage and networking. With old school 1U pizza boxes, that’s basically 100kW/rack. If you start adding GPUs, just double or quadruple power density right off the bat. Of course, assume everything is direct liquid cooled.