This to me is actually a problem with how iOS works versus traditional desktops. Almost everything you create is a file, so you could justify putting almost any

This to me is actually a problem with how iOS works versus traditional desktops. Almost everything you create is a file, so you could justify putting almost any feature in the files app. The files app should be exclusively for listing/moving/copying files. Files themselves should be created by and opened with different apps. This isn't to say apps shouldn't be able to talk to the files app. On macOS, for example, apps can install QuickLook plugins.