Great to read that. I am still digesting Ben's FEP, but I agree that complexity may be a risk here.
As a first thought, I guess it may be important that when such activity is introduced, this goes with some guidance to developers of how to name it in their platform software.
If #Friendica starts using the activity for introducing "True Friendships" and some reddit-like platform puts it under a button "Plus Poster", is that a problem?