Because it’s an extra expense, not just to install but to maintain. They put them on the exterior door because it lets people in faster and easier (more customers) and is easier to haul out your purchases when you leave so you are encouraged to buy things without thinking as much about logistics. Bathroom doors being automated vs manual is almost never going to affect sales.
It’s strange that automatic doors are standard on the outside of just about every shop, but nobody has ever thought to put them indoors.
Because it’s an extra expense, not just to install but to maintain. They put them on the exterior door because it lets people in faster and easier (more customers) and is easier to haul out your purchases when you leave so you are encouraged to buy things without thinking as much about logistics. Bathroom doors being automated vs manual is almost never going to affect sales.