Well, that and it’s the LAW to do so in airports — they ask you if you kept your bag in clear view at all times.
And, to continue the thought, the ONLY place you can fit your rolling luggage in the stall is at the door. Plus, you want to keep everything you own as far away from the toilet as possible, because a lot of people mess up the floor around the toilet.
In fact, some people take wide stances in toilets to help hold their pants up so they don’t touch the floor, because of the filth on the floor around the toilet.
Excellent points. The bag by the door thing is just completely bogus!