Is food in Rome's restaurants usually produced off-site then delivered? [closed]

I'm in Rome on vacation and I've noticed that all the pasta carbonara I'm having looks the same, costs approximately the same, tastes the same etc. Most of the restaurants have very similar items on the menu.

I've also noticed comments such as fixed portion, frozen and we're out of it. That, combined with the waiters' reluctance to adapt the order to my request (more garlic, fettuccini instead of spaghetti, slightly bigger portion, al dente etc.) makes me suspect that something's fishy.

Is it the case that food is delivered to the local restaurants pre-made, frozen and ready to microwave?

I'm around Spanish Steps. It's obvious that some of the mentioned phenomena can be explained by competition, geographical proximity, customers' demand etc.

Still, am I entirely wrong in my suspicion?