Couldn't Debian standardize uid:gid numbers for daemons? The oldest--and
only strictly UNIX-like--GNU/Linux (Slackware) does this so if you install
multiple instances and want them the same, you can backup /etc/passwd & /
etc/group from one and use them on another (as long as there aren't
different users which is sometimes the case). This standardization was
probably from UNIX/*BSD.
What happens every time I can't use *BSD or Slackware on a server and
resort to Devuan (or Debian-based for some users' PCs) is that all the
uid:gid seem random so there's no way to administer them all with the same
files in cases that it'd work. Having random uid:gid is a last-rate
style.