It drives ma absolutely bananas that you cannot easily invert your mouse wheel direction in either Windows or Macos.

When I scroll up my brain breaks because the display goes in the opposite direction to what I expect.

You'd think it would be a key feature because every game provides direction inversion.

What are you referring to? Inverting scroll wheel direction in macOS is trivial (and one of the first things I change), you just uncheck the "natural scrolling" checkbox.