Gregory's Server
I doubt that it helps ActivityPub if we try to downgrade anything to the very limited possibilities of mastodon UI.
I think mastodon would "convert it".
Also see e.g. https://www.w3.org/TR/activitypub/#conformance
ActivityPub conformant Server
"This designation applies to any implementation of the entirety of the server portion of the client to server protocol."
This does not mean "only Note object type, only Person actor type, no i18n support, few properties etc."
It means "the entirety" …
cc @cwebber
@sl007 @cwebber why would I release AP software that publishes events nobody I know can consume today? If there were a way for me to publish these as both an Event and as a Person for compatibility I would definitely consider it. That way, the gathio software can get used by current popular software, newer clients that are more compliant could benefit from gathio in the ecosystem, and then the popular software could hopefully eventually support the "correct" object vocabulary.