If I got it right, Google intends to provide the real OS version number through the `Sec-CH-UA-Platform-Version` Blink/Chrome has just enabled Client Hints on Feb 11, 2021 [UA-CH] Enable feature and runtime flags by default https://chromium-review.googlesource.com/c/chromium/src/+/2525742 Client Hints is still being discussed for Gecko Bug 935216
Bug 1679929 Comment 37 Edit History
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If I got it right, Google intends to provide the real OS version number through the `Sec-CH-UA-Platform-Version` https://groups.google.com/a/chromium.org/g/blink-dev/c/hAI4QoX6rEo/m/qQNPThr0AAAJ Blink/Chrome has just enabled Client Hints on Feb 11, 2021 [UA-CH] Enable feature and runtime flags by default https://chromium-review.googlesource.com/c/chromium/src/+/2525742 Client Hints is still being discussed for Gecko Bug 935216