When I encountered a would be attacker in a parking lot, I was between my own vehicle and someone else's. I had about 13" of space between the vehicles , and zero room to move back or forward. I had to turn sideways to fit.
Sidestepping anywhere would be impossible- door mirrors, natch.My options were slide awkwardly to the left, or the other direction.
IMO, an instructor should focus on the concept of movement, and not a one size fits all specific movement.