So, outside of Apple, there's this concept of what they call a "desktop replacement" class of laptop, which is a laptop which has the specs to be used as a primary desktop when hooked up to, say, a monitor. And for most purposes, the MBP is pretty close. So here I am with a MBP on a 30" display, and it's okay. But if they made a proper high-end machine, it'd be great.
Like, say I spend $3k on a laptop, and $2k on an imac. What if, instead, I could spend $4k on a laptop, and have a machine which is just as upgradeable, and powerful, as the imac, but is still a laptop I can take with me? That would be way better.