There's a difference between "back stab" and "back wire". See Leviton's BR series as an example of the latter. Back wires are quicker to install that side wire but they also tend be a bit more expensive. I'm not sure that the increased productivity offsets the increased price. And since most customers look at price not quality of life for the electrician it's harder to be competitive on a bid.
While I understand that "back stab" is "acceptable" I'm inclined to believe that any electrician that uses that "feature" is, well, just lazy. Probably the best rationalization I've heard went something like, "If back stabing is so great why is there a ground SCREW?".
