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@atomicpoet regarding 2, I think its itended to be extensible with new lexicons:

"[...] Bluesky currently supports a micro-blogging mode: the app.bsky lexicon. Developers who create new lexicons would likely deploy a corresponding App View that understands their lexicon to service their users. Other lexicons could include video or long-form blogging, or different ways of organizing like groups and forums."

(from https://blueskyweb.xyz/blog/5-5-2023-federation-architecture)