This is such a great point. A lot of websites go to two opposite but equally repellent extremes with their desktop and mobile sites. For the desktop site, they will shove five pounds of crap into a two-pound bag. Then for the mobile variant, they will strip away some of the fluff, but also omit a lot of detail that actually does contribute to usability — for example, mobile sites sacrifice any ability to actually find what you're looking for a lot of the time, which is egregious because you need more help with that on the iPhone. (The standard mobile WordPress theme is a big offender on this. I want to throw my phone at the wall every time I come across a site using that theme. Tiny font, excessive padding, no navigation to speak of. Ugh!)