I would argue that this is by design. If you cannot figure how to do it, despite fairly simple and quick instructions, you probably shouldn't be sideloading apps on your phone.

It costs you nothing to sideload an app (other than time), but it costs money to make a company. Not a fitting analogy.

Sideloading an App is non trivial and not something that one would expect their userbase to undertake and it requires the user to have access to a Mac to perform it.