I wouldn't call it a very good point. I'd call it, based in no small part on your response, a bias towards people who use MacBooks. It's unfortunate to see this attitude towards the very large segment of the internet-using population that are using "older" input devices (which are still much more practical for many use cases).
If you actually look at the mousewheel JS events generated by goddamn Macbook trackpads, they're painfully evil. I have yet to find a really solid library for handling them, and my own attempts are hackish to the point where I'm considering splitting it into a special "Macbook trackpad" case. On the browser.
and iPhones and iPads and android phones and kindle tablets and ....
Web traffic for some (most?) sites is already tipping over the half-mobile-usage direction (where "mobile" means "doesn't have a built in full-sized keyboard").
Exactly, its not just MacBooks. I used a Lenovo recently that has multitouch and scrolls wonderfully with two fingers. At work, I use a multitouch trackpad instead of a mouse.
