I think these are pretty obtuse use-cases these days for the vast majority of people. I also manage videos and things but I do it via the cloud like most people. You may disagree with a that but it explains why they went that route - it wasn't a case of them not thinking.
Why? You keep repeating this without ever defending your argument. As of right now, and in the near future, more Mac users have USB-A. There is simply no compelling reason to make this change unless you absolutely need extra features provided uniquely by USB-C. And this device doesn't need anything like that.
The reverse problem (I have lots and lots of USB-A devices, while the only USB-C device in my house is my wife's Android phone, so like almost everyone else I had "no compelling reason" to want a device with any USB-C ports, let alone only USB-C ports) didn't convince Apple to leave one or two USB-A ports in their pro macbooks, unfortunately. That you can't go buy a current macbook and current iphone or ipad and connect the two when you get home unless you buy extra stuff, but you can if you have an older macbook, is silly. It is a point in favor of that "Apple's greatest MacBook Pro yet: the 2015" joke/actually-true-thing, I guess.
I know it's a problem! But I don't think it's Apple's job to forever hold back their development for people's very particular personal problems. You bog a product down by making sure you can handle all these issues. Keep it simple and move on, I say.
If you can't get reliable WiFi maybe the iPad isn't the product for you? I don't think that's an issue - there's loads of other products on the market and people who do want the clean Apple experience can get that. Why do all products have to do everything and suit the entire world's crazy workflows? You end up with a Homer Car.
Because it was initially designed and delivered that way?
Because they like manually managing music and videos? etc