Right now I use a MacBook Pro to do my work ("pro", remember?). I need a faster machine, so I will have to upgrade. And I will have to deal with all the dongles, carrying them, remembering about them, losing them, etc. I expect I will eventually make an idiot of myself in front of a client, once they hand me a flash drive with their data and I'll have to admit red-faced that I forgot the dongle thingy.
MacBook Pro used to have the "pro" philosophy: stick every port in there, so that the only thing you have to carry is your macbook and you're ready for everything. Then it started: ethernet disappeared, DVI went away, and successively all ports went away until now we are stuck with 4 ports of the same kind, that are useless (but hey, they show great promise!).
I don't want a thinner machine. I don't need a lighter machine. I need a machine so that I can do my work. Pro, remember?
Price is largely not an issue if you actually use it for work, so I have no complaints there.