B737 MAX 8 Captain reported a safety concern with deplaning the aircraft without a tail stand. The aircraft tail settled and the aft service door came into contact with the air stair preventing closure of the door until the air stair was lowered.

Narrative

I'm writing this report to highlight the need to use tail stands on MAX 8 aircraft during deplaning. I was in a situation in a MAX 8 during deplaning; in which the forward cargo bin was unloaded prior to the aft cargo bin and Company X was servicing the aft galley through the aft entry door with the use of an air stair. As the weight of the nose lessened; the aircraft's tail settled some; to an extent that the aft entry door settled on top of the air stair and the aft entry door could not be closed. The air stair had to be lowered first and then the door could be closed.I believe the reason we do not use tail stands for MAX8 Aircraft is due to Boeing guidance. I believe that Boeing guidance suggests that based on the weight and balance envelope of the MAX8 during deplaning; there is a very low probability that it will sit on its tail. I get that. However; I believe there are other threats. I believe that under this scenario; there is a high probability of aircraft damage to the aft doors and hinges; damage to air stairs; or injury to personnel. I believe these threats warrant regular use of tail stands during deplaning MAX8's.