Right now, [the draft](http://httpwg.org/http-extensions/draft-ietf-httpbis-client-hints.html#client-hint-request-header-fields) defines the opt-in mechanism and requires is use [with a SHOULD](http://httpwg.org/http-extensions/draft-ietf-httpbis-client-hints.html#security-considerations):
> Implementers SHOULD support Client Hints opt-in mechanisms and MUST clear persisted opt-in preferences when site data, browsing history, browsing cache, or similar, are cleared.
Otherwise, it's optional (and this is reinforced in several places).
I think that the minimal change that the TAG wants is to remove/reduce that SHOULD, correct? Or is it preferable to remove the opt-in mechanism completely? What about the Feature Policy integration?
For background, [this issue](https://github.com/httpwg/http-extensions/issues/372) covers some of the privacy discussion.
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