[zimzam]

In web development there is often a single place you can put a feature flag though.

For example maybe the feature flag just shows/hides a new button on the UI. The rest of the code like the new backend endpoint and the new database column are "live" (not behind any flags) and just invisible to a regular user since they will never hit that code without the button.

As far as "remembering" to clean up the feature flag, teams I've been on have added a ticket for cleaning up the feature flag(s) as part of the project, so this work doesn't get lost in the shuffle. (And also to make visible to Product and other teams that there is some work there to clean up)