I think we might just be posting from different universes or something. Where I'm at USB-A is not really a niche interface. I don't know what to tell you.
Yes obviously, if I get all new peripherals with USB-C compatibility (other than things like my keyboard and mouse, which don't have USB-C versions, and which are actually my favorite peripherals) then I won't encounter USB-A. Unless I leave my house, where the rest of the world hasn't upgraded to USB-C yet.
There are $3 versions of the adapter. Yeah this USB shit is annoying but I bought 10 of each. 2 sets in backpack, 2 in computer bag, 2 in desk and a few permanently attached where they’re used most often.
Annoying but fine. Don’t think about it much.
Edit: YMMV but Macbook is not the only offender. Comes up with random combinations of things because cars, desks, cafes, etc all have a mix of USB A/C charging ports. And so do my various devices. The adapters are useful all the time.