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

(pardon the delay in response, in the middle of a move)

On UA Reduction:

Mozilla has taken independent steps to begin freezing information in the User-Agent string (see [1][2]), and is positive on the concept in general (see [3]). Apple has also frozen (or capped) most information in the Safari User-Agent string (see [4][5]). We would like to document how browsers have already taken these steps in the WHATWG compat standard (to start with, anyways - it may make sense for this to ultimately live in another spec). We met with Mozilla a few months back to discuss the issue of freezing the macOS version number (we invited Apple, but nobody was able to attend due to short notice). See https://www.otsukare.info/2021/03/02/capping-user-agent-string for minutes. 

Personally, I would welcome participation from any browser vendor or interested party to help here: https://github.com/whatwg/compat/issues?q=is%3Aissue+is%3Aopen+%5Buastring%5D

On UA-CH:

Mozilla is neither positive nor negative on User-Agent Client Hints ("non-harmful"). We don't have a formal position from Apple one way or the other, but @othermaciej has filed a lot of high-quality bugs on the spec (only 1 out of 16 remain unresolved, see [6]). Edge has stated that they are supportive of User-Agent Client Hints (see [7]), and have also filed some high-quality bugs on the spec (two of which I hope to address soon, see [8]).

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1679929
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=1693295
[3] https://github.com/mozilla/standards-positions/issues/202#issuecomment-558294095
[4] https://webkit.org/blog/8042/release-notes-for-safari-technology-preview-46/
[5] https://twitter.com/__jakub_g/status/1398324307814752256
[6] https://github.com/WICG/ua-client-hints/issues?q=is%3Aissue+author%3Aothermaciej
[7] https://twitter.com/_scottlow/status/1206831008261132289
[8] https://github.com/WICG/ua-client-hints/issues?q=is%3Aissue+author%3Aerik-anderson+

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