To mobility? There is none. It's a basic human trait. Animal trait. Living in the same place is the abberation.
how do you determine if that is good or bad? humans have lots of basic traits and tendencies that have been demonstrated over written history. does the fact humans have always done something mean it is good?
Why does it need to be bad or good? It's what separates animals from plants: locomotion. You might as well think breathing air is too pleistocene for you?
because it affects real public policy. so, how do you determine if the use of this mobility is good or bad? because that's what's going to inform one's position on public policy.