[Accept-CH] is a relatively new approach; we're still evaluating - are done evaluating?

[tomrittervg]

Require servers to advertise or opt in to access data.
Even for data sent in HTTP request headers, requiring servers to advertise use of particular data, publicly document a policy, or "opt in" before clients send configuration data provides the possibility of detection by user agents or researchers.
For example, Client Hints [[?httpbis-client-hints]] proposes an Accept-CH response header for services to indicate that specific hints can be used for content negotiation, rather than all supporting clients sending all hints in all requests.
This is a relatively new approach; we're still evaluating whether this provides meaningful and useful detectability.

This was written just over 6 years ago. It seems like we should remove this note about evaluating it, and decide what we think of it.