We all know how to do that. In fact, I make a good bolognese sauce on my own. Personally, to get it the way I like it, it takes about 3 hours of simmering. I don't want to do that much anymore, nor do I want to make batches and freeze it. I don't have enough freezer space, nor space to buy a freezer.
Sometimes when I get home from work, I want to do the bare minimum but still enjoy my food. I don't want to saute things, and add to things, and so on. I just want to open that jar of Rao's and enjoy it--which I do. But only specific flavors (green bell pepper and mushroom or Italian Sausage and Mushroom).