For example, say you want to grow new kinds of fruit that have never existed. Having a concept of fruit is necessary to conceiving of that idea. Life’s not going to give you examples of fruit that have never existed! You have to explore the conceptual space of all fruit.
Note that under this interpretation, no “general” or “extended” version of the concept is ever created (the template is anonymous, and is discarded as soon as it “goes out of scope”—which is to say, as soon as it has been used to create the new concept). There is thus no need to ask the questions of what this new, “general”/“extended” concept means, to what else it may or may not apply, how to differentiate between uses of it and any specific version, etc.
It’s not, actually. See this old comment of mine: