Some people do perceive smooth scrolling as annoying, but for the most part what he's referring to was because of JavaScript ScrollEventHandlers being run in be

Some people do perceive smooth scrolling as annoying, but for the most part what he's referring to was because of JavaScript ScrollEventHandlers being run in between the user moving their mouse wheel and the page actually scrolling. This was fixed with Asynchronous Panning and Zooming (APZ) which moves the webpage and runs the ScrollEvents in parallel on different processes.