@mmn As you didn't answer yet, I will put my question another way:
Do you, as a main GNU Social developer, recommend to switch a client application from Twitter API to Activity Streams in JSON format?
The format specification got a follow up, which we may become confirming to in order to ease integration with other systems: https://www.w3.org/TR/activitystreams-core/
?!
BTW congratulations for making more commits to GNU Social codebase than Evan did.
PS: I suspect that no GNU Social client application uses Activity Streams JSON format to connect to GNU Social. Am I right?