I don't think that it is "old way" versus "new way"; but it seems clear to me that someone has to know the recipe. If you buy a pre-made can of mushroom soup, obviously the manufacturer must have used the recipe. And then there's the issue if none of the brands of mushroom soup are of adequate quality for your purposes.

It's like the difference between a programmer writing his own routines or using a pre-packaged library. I think, in order to be considered a competent programmer, you should be able to write your own routines, even if you don't have to in the majority of cases. A cookbook is open source for food. "Buy 3 cans of Kraft spaghetti sauce" is cheating.