Actually most do want "robots" when you get right down to it. They want residents who will fall into line and do exactly what they're supposed to like all other residents without complaint, who will finish the residency in the alloted amount of time (which means not veering off the path as you put it), and ultimately pass the board certification exam. That's how residency programs stay accredited. Which if you're a PD is the bottom line, everything else is secondary. And they pick residents who they think will most likely achieve that.
That's why they consider your board scores (predictor of passing the board certification exam) and letters of rec (which is basically their colleagues vouching that you're clinically competent and that you behave).
Medicine is all about status quo...algorithms, criteria, accepted standard of care, allegiance to hierarchy, etc. Deviation from the status quo is not tolerated much. Even the doctors who like to think of themselves as "rebels" are still conformists when it comes right down to it.