They're "more free" to do the pure bringing-stuff-out, because they know they might have to budget 30 mins or more for a complex purchase with lots of hand-holding and transferring and stuff, while a bring-out is always going to be short.
And, if you don't have your phone on you, you could buy a Mac using one of the demo Macs. I think that's almost part of the reason they're there, at this point—they certainly do prominently feature the Buy Now buttons on the kiosk modes they pop into.
I guess I should have gone around the store and figured that out?
How would I have known that clicking a button on a computer in the store will get me a person faster than an actual person telling me they will get me a person and not just that same person eventually coming out knowing I clicked the button?