Earlier quoted context omitted.
Yes, as you say, Integrity is preserved. However, Confidentiality is also another important aspect of Information Security. Making a 3rd party appear as a 1st party, is a privacy and confidentiality violation, which is why I do not like AMP and signed exchanges.
Yeah, as near as I can tell signed exchanges are essentially a caching proxy. With integrity checks, so that you don't have to trust the proxy all that much and its agency is much reduced. I'm reminded of apt. The calculation appears to be that given the chance, some website controllers will choose to trade confidentiality of public pages for better load times. In business terms, this seems a pretty straightfoward wi…
A publisher is free to switch to AMP, but choice needs to be given to the user to agree or leave the site the same way it happens with cookies. I wouldn’t opt in and now I cannot block Google tracking at the DNS level thanks to this.