> Just give me a dumb lens that does exactly what the body tells it to do.

It's hard to convey, but for instance you can reverse the fo us ring rotation, which probably only resonates with people who had to deal with it daily.

Or you can adjust the ring travel.

Or make the focus ring work as an aperture ring instead. Or straight disable annoying buttons.

Up until now you'd have to go hunt the perfect lens where the maker was 100% on board with your preferences. Or adjust your whole shooting style to every gear you use.

Sure a camera body could handle every single settings of third party lenses. But given what we've seen these 2 last decades, I don't think there was any chance of that happening. Tamron is partly Sony owned and they still did it on their own.