silverpill@mitra.social helge@mymath.rocks theoretically it is possible to reduce down any activities your software doesn't understand into a "generic" presentation — it likely needn't be user facing. Though I do think at that point you'd need to save the original AS payload for future processing, potentially.
Realistically I would probably expect implementors to support only their subset of activities and objects. It falls short of the ideal, though the ideal is well worth shooting for.
cc badrihippo@fosstodon.org