I think we underrated the power of the actor model and the extent we can incorporate it on the #ActivityPub fediverse. Somehow we got eternally stuck in talking about HTTP plumbing and core protocol capabilities that we never fleshed out thoroughly in order to be able to just focus on the higher-level concerns of app and service modeling.
Actor systems based on loosely-coupled event-driven architecture, delegation, supervision, supervision strategies, inbox strategies, let-it-fail, actors fronting domain aggregates, service-orientation, etc.
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