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Why doesn't Firefox implement Private State Tokens?
(reddthat.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Tl;Dr the protocol requires there to be trusted token providers that issue the tokens. Who do you suppose are the trusted providers in the Google and Apple implementations? Google and Apple respectively, of course. Maybe eventually there would be some other large incumbents that these implementers choose to bless with token granting right. By its nature the protocol centralizes power on the web, which would disadvantage startups and smaller players.
Ah yes, the RCS problem. Thanks for the clarification!