@jdormit @sean @Are0h @jalcine
ActivityPub is a more like a 75% solution, not a 90% solution. Maybe from the perspective of syndicating blogs it is a 90% solution, but from the perspective of interconnecting communities, there are many problems: abuse mitigation (which cause strife between users and admins and between instances), broken signature schemes (which endanger activists), lack of deniability (big oof for marginalized people), the lack of being able to directly define what interactions you want with your posts, etc.
Yes, absolutely we can get there, but it's not a "90% solution". There are significant parts of the protocol that need to be revisited and retrofitted with security features.