Photos taken on the camera, shared to you, or “saved to photos” will live in the Photos app. The files app primarily contains things you download from your web browser, including images downloaded and not “saved to photos” and images extracted from zip, etc. I guess some apps can save data there too. It would be nice if there was a back road to images stored in Photos app via Files app, but the distinction is otherwise well defined.
Aha! So some photos are actually 'files', but some are not! The confusion continues! I get why Apple has it this way - current iPhones are very very popular and selling them with the current UX makes Apple a lot of money.
But it's pretty clear that the Files app is not meant - in any way - to help users understand computers, what files are, etc. It is obtuse and confusing as soon as the user wants to leave the iOS ecosystem (even to go use a Mac).
My girlfriend had the craziest workflow. No laptop, only iPhone and iPad Pro. She had an external USB-C hard drive, she couldn't connect it to her iPhone but could to the iPad.
What she would do is airdrop photos from her iPhone to her iPad. Copy them from the gallery to the Files app. Move them in the files app to the hard drive. Then delete them from the gallery app, delete them from the Files app and the trash.
For some reason, deleting files in the Files app didn't free up space on the iPad. So she had to uninstall and reinstall the Files app to get the space back.
As a Linux user that grew up DOS, the whole thing just broke my mind. She was frustrated and I was frustrated I couldn't help her.
you're jumping to conclusions. One does not follow from the other.
(a) apple doesn't show users all the files on their iPhone
(b) apple makes lots of money
There is no evidence that a causes b. It's possible showing the files would make them even more money. It's also possible showing the files would have no effect on how much money they make.