? (cybre aspect)@luka twidere does this for pleroma and mastodon (as well as Twitter) and is probably the closest to what you're suggesting, if you're interested in trying it.
what about platforms that don't support boosting? (reddit clone comes to mind, and pixelfed i guess?)
what other fedi platforms were you thinking of?
i think id prefer nomadic decentralised identity. one account to log into all platforms. different platforms can have different interfaces and i think this is a good thing.
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