I'm not trying to understand it's "technical merits" but what exactly it is. Even experts on The Registry are quoted saying it's "nebulous".

So what exactly are we even talking about here? The idea of attestation or just this proposal or is it a Google thing? Does this compare to cloudflare private tokens or safetynet or are they completely different? If proposal goes through what does that functionally mean for browsers both ones based on chromium and ones not?

I don't know why it's so difficult to find these details and I'm instead being told to just accept the idea that the premise is unacceptable.