Earlier quoted context omitted.
Probably never. The divergence between macOS and ipadOS is not technical, it's that Apple believes a touch-oriented and a pointer-oriented interface are completely different things.
ipadOS has pointer support and the preferred way to do pointer interactions on macOS seems to be touchpads (not mice), so the gap is definitely not as large anymore.
Yes, but it does not mandate a pointer.
> the preferred way to do pointer interactions on macOS seems to be touchpads (not mice), so the gap is definitely not as large anymore.
A touchpad is a pointer device with a similar level of precision and interaction as a mouse. One completely unlike touch.