Modern feature flag tooling (eg. LaunchDarkly) cover most of the uses here. It'll even tell you whether flags are useful or not (if you push evaluation data back upstream).
Good point. It's possible the real issues have more to do with price point/positioning and product UX.
My experience with LaunchDarkly has been that a lot of these hygiene-related exist only in their top tier enterprise plans, and even below that point the cost of the tool starts to draw attention.
On the product UX side - I've found these tools are designed for engineering/Devops users but (whether by design or not) by product, success, and some ops users as well.
