-You are overestimating the amount of shit produced in one siting XD.

People who don’t wipe very often smell - especially if, as in Roman society, you would not have necessarily been taking every shit at a convenient latrine.

Also, I you get yourself dirty is YOUR shame, so more interest in keeping yourself clean.

Romans were a very communal society, and as mentioned, public cleanliness and the idea of ‘foul air’ causing illness were important ideas to the Romans.

You don’t have to go that deep.

The hole isn’t large and the latrine isn’t exactly shallow. How deep are you going to get in that before you have to put your arm in there?