edit: I thought they were talking about ActivityPub since the issues look similar to ones people raise about it. Whoops.
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I am of two minds here:
1. Minimal specification worked for HTTP.
2. Most problems with HTTP come from it being minimally specified.
ActivityPub is exploding the way HTTP did. At worst, it's as imperfect as HTTP. At best, it's a way to get people used to federation for whatever comes next and improves on it.