Re: [w3ctag/design-reviews] User-Agent Client Hints & UA Reduction (#640)

A couple of additional questions:

1. Was introducing a HTTP cache feature for varying on parts of the `User-Agent` header considered? (For example, instead of introducing `Sec-CH-UA-Mobile` in order to be able to say `Vary: Sec-CH-UA-Mobile`, introducing a response header like `Vary-User-Agent: Mobi` with the semantics that the content varies based on whether the `User-Agent` header had the substring "Mobi".)
2. Considering that there's a proposal to add a TLS-layer CH opt-in mechanism (which in itself looks like rather excessive complexity as the first impression), has not sending any `Sec-CH-UA-*` headers by default (i.e. requiring TLS opt-in even for the basic stuff) been considered?

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