David Megginson writes:

As I mentioned before, passenger entry and exit would also be a
consideration. If you want people to be able to get in or out of the
plane with the engine still running, the door cannot be on the
pilot's side.

I often get in Warriors and my Aztec after my wife has already gotten
settled in to the right side seat. (I usually sit in the right seat
when flying singles though.)

--kyler