In reply to Jeff Chandler.

User surveys, built into the admin itself, accessible at all times as feedback and (with an opt-out for those who don't want to be bothered) popping up at certain times (when community feedback is desired and maybe also every X months in general), and possibly also when certain features are accessed (for the first time, newly implemented, considered for change or deprecation or removal etc.). Yes, it will tell you what people think they do, which may be different from what they actually do, but it will also tell you what they'd want in terms of future development, which telemetry won't. And sure, it'll just be the opinion of those who care to give it, but if they wouldn't even care to check some boxes and maybe fill some suggestions now and then, I'd say they don't have an opinion to give anyway.