It boils down that if #activitypub is a hammer, then not everything becomes a nail, i.e. use it where it shines.
(though most people mistakenly think AP is mostly for microblogging, because that's the dominant application domain it is used in now)
Discussions are on https://forum.fedeproxy.eu/
I agree 👍 #ActivityPub is no good as a transport to synchronize data repositories (which forges are).
I disagree 👎 ActivityPub is perfect to be notified when there is activity on a forge and #forgefed is way to express what happened.
This is explained in more details in a 6 minutes video published last month in the context of @fedeproxy.
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