In my mind, ActivityPub deals with the transport/data layer by providing a standard way to represent objects, activities and broacdcast those over the federation.
But how can a client implement a generic and meaningful UX for every server?
But Plume supports Markdown, while Mastodon doesn't. I don't know for Pleroma but you get the idea.
How would the client know what the server support in terms of features?
Funkwhale and PeerTube instances deal with Audio and Video media, respectively, PixelFed with images, Mastodon and Pleroma with small-to-medium text, Plume and Write.as with long-form content, etc.
Do you think it's possible to provide a unique and comfortable experience for all those projects ?
The big secret here is that I'd asked "everyone other than Chris" to answer the question at FOSDEM, it's because I'd already asked them this exact question on IRC a month before and they suggested using streams exactly in this way. The reason I didn't want Chris to answer was I was curious to knew what the implementers were thinking (and I already knew what Chris would be likely to say).
Maybe I misunderstand the issue but I think part of it is that right now people are okay with having N ActivityPub identities in a way that mirrors their proprietary service life. "Mastadon, PeerTube, Pixelfed" each on their own. But if you moved the bar the other way, to each of those being some sub-stream of your general AP identity, then you'd insist on a client (or c2s model) that was flexible enough to handle it.
@emacsen @cwebber @eliotberriot @kity of course there's the new problem: which API methods does a server support? what are the limits of each API field? and that's part of the design of the API rather than the design of the server. hence why modified masto or pleroma servers run into issues with the masto API. the server needs to report info about itself a la /api/v1/instance
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