This seems to ignore the fact that some people are more introverted than extroverted (meaning how people "recharge" -- either via "alone time" or by talking to others, respectively). I am more introvert than extrovert, and when I've worked at jobs where I've commuted back and forth, I loved the alone time I had on the bus or train to and from work -- it really helped me regain some mental energy before and after work. If someone started talking to me it would just drain that away, and I'd much rather save that energy for coworkers or loved ones.
