Similarly:
- living on the site (just like with any business, really)
- being able to train and hire Sims I choose, and not have the game generate employees who are useless anyway
- guests staying at their tables and eating the food
- more variety in cuisines/food themes
- probably also a refresh of some BB objects, because I do use a lot of them for regular builds already
ETA: I thought of something else, which I still don't quite understand why it doesn't work: a combination venue, such as a café in a museum or a restaurant with a bakery.