Because most PC builders look like they are unable to figure out how to build notebooks with decent trackpads, keyboards AND screens. That's all. Extensively using both Windows 7 and Lion, I think they are on the same level overall, even if maybe Lion is more friendly to newbies, but that's not my case. But it will be much better than Windows 8, I tried it and it's a huge step backwards on PCs without touchscreens.