MacBook Pro users and MacBook users generally don't overlap. It's fine if you want a super-light, super-thin ultramobiles, but it makes little sense to compromise the Pro's usability in the name of thinness. I've been a Mac user for the last 7 years and for the first time I'm getting a non-Mac computer because the MacBook Pro is no longer attractive. It's a shame, because I have invested a significant amount of time and money on my current setup.
Are you sure about that? When I work at my desk I use a dock and some monitors, and all the heavy lifting is on a remote server. I suppose there could be a selection effect for workers whose employers force them to work solely on their laptop, but is that common?
If you look at derefr's comment, he appears to work like I do.