Most apple fans don't realize that negligible differences in touch responsiveness against a small cherry picked selection of android devices doesn't make up for flexibility, cost, choice...
Except that your finger is bigger than that so you can't see what you're doing anyway. On ANY touch device. STYLUS (as you said) ftw. Or a mouse pointer. Infinitely small.
You are comparing size with time, which is an invalid comparison without further constraints (e.g. a visual response constrained to emanating out from the touch of a finger). Thus, you are making the assumption that all visual responses to the input of a finger will only occur directly under the real estate occupied by a finger - an assumption that I would argue is entirely unfounded in the realm of modern phones.
Agreed. To me it's either when you are at the minimum size of a numbering system with discreet quantum. Also yo ucan do a cross hair with the middle pixels empty so I guess that would be infinitely small, and a closed crosshair would be 1.