what you are asking for is not unreasonable, standing alone. But given the sheer volume of changes made in iOS 13, Apple had to draw the line somewhere and I, personally, am happier seeing substantive as opposed to surficial changes. I like that my phone now suggests a wifi network as a notification or that I can swipe on the keyboard. Your changes would be nice, too, but I'd take the ones they made over the ones they didn't.we're talking about GUI options (android has a lot of them), not dangerous hacks to apps, the OS. i mean.. removing the dock, customizing the look of the home screen (etc etc). am not suggesting apple let us do jalibreak'y things...
And you may disagree and that's fine.