The appeal, at least for me, is having a social layer on top of your own stuff. Are you familiar with POSSE (Publish (on your) Own Site, Syndicate Elsewhere)? With AP you skip the whole second part because it's automatically syndicated everywhere the moment you post on your own site.

I'm having good results with the WordPress ActivityPub plugin on my blog[1].

[1] https://manualdousuario.net/en/