I'm not clear what you are asking. (Honestly having a hard time grokking your sentence here, my apologies.) I think you are appealing to what many would consi

I'm not clear what you are asking. (Honestly having a hard time grokking your sentence here, my apologies.) I think you are appealing to what many would consider degenerate cases to assert that because it can have uncertainty, it always has uncertainty. Is that accurate? If so, I don't disagree that movements can be ambiguous or hard to reason about. I'd assert the majority are not, though. To the point that in normal use, it is a fair assumption. And again, you are free to disagree on this one. As someone that learned to type and edit without having to look at keyboard or screen, visual affordances sometimes feel off to me, personally. Doesn't mean I think they have no purpose.