Subway "Sandwich Arists" often suffer from the same lack of sandwich etiquette as many other sandwich places and kebab shops.
If there are 10 fillings available for example and you happen to only want 3, the expectation should be that sufficient quantity of those 3 fillings will be provided to ensure that the 3 filling sandwich, wrap, roll or kebab is comparably sized to the 10 filling equivalent.
Far too often the 3 filling sandwich looks like an anaemic poor cousin, leaving a void of under-utilised sandwich space and an unsatisfied customer.
Just yesterday I ordered a chicken caesar wrap from a small lunch bar. When I asked for no egg, not only did the vendor oblige in not ruining my lunch by the addition of an ingredient which was requested to be specifically excluded (another sandwich making faux pas) but she told me she would add extra bacon and lettuce to make up for it. Birds sang, sun shone, children laughed. For a brief moment all was well with the world.
NB: We're talking about sliced tomatoes, grated carrot, chopped lettuce etc. here. It's not as though people are ordering sandwiches and saying 'hold off on the onion, just fill it up with caviar thanks'.