Something inexpensive that enables people to pay for not going to the effort to cook relatively tasty food exists everywhere that’s large enough to support the overhead, since before the modern times. It doesn’t have to be particularly good or healthy, but it does exist. In some European cities supermarkets just sell packaged premade salads and pasta, for example.

Personal service might be more expensive overall, but I’m not ready to immediately declare that obvious just because the people behind it are visible to the buyer.