I don't know, not everybody has a macbook or a magic mouse. Plus even old, small, unprecise PC touchpads were enough to scroll a website. To me, it looks more

I don't know, not everybody has a macbook or a magic mouse. Plus even old, small, unprecise PC touchpads were enough to scroll a website. To me, it looks more related to the recent fashion of "minimal" interfaces. Like material design and ultra-skinny fonts. Could also be related to the "infinite scroll" some sites have. A scroll bar doesn't make much sense for those.