I don’t really understand why you would list this as a peeve. Some delis serve their sandwiches loaded up with massive amounts of meats and it’s probably because that’s the way their customer base likes them. Customers who don’t like the piled-high sandwiches probably don’t order them, opting for something else instead, or maybe they make a special request to limit the meat on the sandwich.
It’s a simple matter of excepting that we all like some things and dislike others. I’m sure there are certain sandwiches you don’t like, but I doubt you would list them as a peeve. If you simply don’t order a piled-high pastrami/corned beef sandwich because you don’t like how they build it, your peeve will magically disappear.