Excellent summary. I think the final paragraph is the most important, but also: at least in theory, any particular round with a central coordinator and anonymous counterparty, cannot be guaranteed to not be Sybiled by the coordinator.

With any form of coordination, that's possible; indeed that was a common early critique of Joinmarket, and even imposing anti-Sybil style costs doesn't remove that risk, either.

The reason I always saw that risk as worse with a central coordinator was the standard CPOF arguments.

Let's not forget that a central coordinator offers big advantages, too.