Further posts imply that any cluster Doff mission will advance the accolade. You could run multiple missions simultaneously. That's what it looks like anyway.
Sure, depending on which DOff assignments apply to the Accolades, which have how much cooldown, etc.
Still, it's better and less hands-on. That's the part that takes time... Even if you had a constant supply of three Aid the Planets in every Cluster, you're still spending time, loading in-and-out of thousands of systems (not to mention flying into orbit). DOffing for the accolades is more like a "fire and forget" missile. Heh.
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So they continue to introduce accolades that any future customer will be unable to achieve.
This is not the first time this sort of thing has happened. There were a bunch of "Emeritus" (e.g. "Ambassador Emeritus") that were introduced when the old Diplomacy system was replaced by the Duty Officer system. I guess it's inevitable when a system undergoes major changes.