I don't think not blocking for RAs during boot as a decision that
prefers ipv4 over ipv6.  networkd is just doing something else by
default that the kernel doesn't do today, or historically; *and* there
is no toggle for the blocking; only do you want RAs or not *and* if you
say you don't want RAs it disables them in the kernel too.  That's just
not very flexible and breaks at least one known use-case w.r.t radvd
use.

W.r.t the the online-target; what you describe sounds complete. I think
it's worth mentioning that this state can be reached by combining
different interfaces; one may have a default route, a second has DNS,
and a third has an address.

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https://bugs.launchpad.net/bugs/1765173

Title:
  networkd waits 10 seconds for ipv6 network discovery by default

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