Earlier quoted context omitted.
> On a desktop, with a mouse, I have near-perfect precision. I don't need overly-padded icons and windows because I have the precision of a mouse. You do, but not everyone does. Consider the accessibility needs of people with motor-degenerative diseases like Parkinson's or Huntington's. Won't they be better-served by larger click-targets?
That is why Apple provides an accessibility panel in system settings.
In such cases, it makes a lot of sense to just give the change to everybody, so that you can design the UX once, with the change in place.
See also: modern TV shows and films that make sure to not put anything important where closed-captions would appear—they're designing once, assuming captioning.