Touchpad pinch zooming should be smoother just like touchscreen zooming
If you zoom in on a webpage using pinch zooming from the touchpad, there is a noticeable frame-by-frame lag, unlike the Mail app, in which pinch zooming is VERY smooth.
Note: I'm talking about the touchpad, not touchscreen.
Absolutely! Smooth zooming with the trackpad was one of my very favorite features in IE on Windows 8/8.1, which is still not available on Chrome and, extremely surprisingly and disappointingly, Edge.
Kirill Shilov commented
Oh, and also, Safari for Mac implemented this feature way back in 2009.