Apple could have displayed all iPhone apps in settings:cellular whether or not the app uses any data. Then we could disable cellular data access without having to first use data.
They didn’t. Apps only show up there after they use cellular data.
This is really annoying when trying to stay under the data cap of #2’s $40/year mobile plan. It also confuses the heck out of customers.
I don’t think this will get fixed those. Apple’s technical debt fix list is deeper than Valles Marineris.