Anyways, the alternative to what Apple is doing is the "everything but the kitchen sink" that Microsoft is known for. If there is an edge case out there, or a tiny minority of users that need something, then they get it!
And the end result is something like Windows. Suitable at any task, but master of none. As well as awfully bloated, unloved and unelegant.
Instead Apple makes a product that can do 95% of what you want it to do, and does it really, really well.
Besides what is it you want to do? You can probably do it on an iPhone, even though its not implemented in the exact way you'll like.
For example, I can download PDFs and files, transfer them to other people (I believe that was your example) and I can do it all without root access/a file manager. You might want it, but you don't really need it.