Whenever I use a D-Pad, I use it like I do regular buttons, lifting my thumb off the D-Pad and moving it to the direction I want to press before moving it down again
Thing is, I don't think most people use a D-Pad this way. I have a feeling more of us use it the way I do: thumb on it at all times, regularly sliding from one direction to another when continuous movement is required (fighting games, shoot-em-ups, retro games, etc.)
I sometimes use a D-Pad in the way you describe (navigating menus) but not nearly as much as in the way I described above.
If and when I do get a Switch, I'll be completely uninterested in USFII unless/until I get a Pro Controller.