The collection of facts is entirely unprivileged and has very little to do with PID1. PID1 is privileged and single-threaded and a point of contention, so we shouldn't put things in PID1 that don't need to be there. A separate service can be enabled/disabled/started/stopped at will, is easy to sandbox, etc. If it turns out to be necessary to collect some facts through PID1 in the future, we can always add a smaller facts endpoint to PID1 again.
System and Service Manager
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