[goosedragons]

Loads and loads of mice can do horizontal scrolling while having two mice buttons, e.g. Logitech MX Master, Razer Naga, etc. It's not uncommon for high end mice to have a mouse wheel you can tilt left or right to scroll left or right or some other system.

The Magic and Mighty mice support horizontal scrolling in spite of being one button mice and not because they are one button mice. Apple laptops kept with the whole one button thing even into 2000s where it was pretty painful as there was no scroll mechanism at all, no right click mechanism at all besides a key combo.