#ActivityPub "The Good, the Bad and the Ugly" is a good article by @dominikDominik Chrástecký - Blog
https://chrastecky.dev/technology/activity-pub-the-good-the-bad-and-the-ugly
The two mentioned examples in "The Bad" are long-time issues that were also discussed at #SocialHub. I just responded to one of them on the forum..
The #Mastodon Update(Note) quirk. https://socialhub.activitypub.rocks/t/update-note-quirk/4545/14
The other one is around Direct Messages which are a hack (a Note with special sauce). #LitePub specifies ChatMessage object type here, which is the intended way to extend the protocol. #FEP