Are there a substantial number of macOS users using touchscreens?
EDIT: I don't know how I forgot about pinch to zoom via the trackpad. While my original question did start me down an interesting rabbit hole of touchscreen MacOS, I 100% agree that a lack of smooth pinch to zoom via the trackpad detracts from the overall user experience.
No macOS machines ship with touchscreens, but trackpad gestures are used heavily throughout macOS. I find pinch zooming on the Mac to feel pretty natural.
EDIT: I don't know how I forgot about pinch to zoom via the trackpad. While my original question did start me down an interesting rabbit hole of touchscreen MacOS, I 100% agree that a lack of smooth pinch to zoom via the trackpad detracts from the overall user experience.