"Arguably, you can't fix things with it" - you can fix certain things, thanks to resurvey quests that were added.

For example resurvey of old opening hours data, recent version (v28.0) added also ability to directly handle shop that is gone and replaced by another (it may not be released for you, especially if you use F-Droid). See https://github.com/streetcomplete/StreetComplete/releases/ta... for details.

For full scale editing on Android see Vespucci.