The Fundamentals class is an unusual one, one that straddles the line between recreational and technical diving. It can be taken in a single tank, so it is very much a recreational diving class. But it introduces skills that are usually reserved for technical classes, and begins the change in mindset to a proactive one, which is very much the hallmark of technical diving.
But I believe (and I suspect boulderjohn agrees with me) that many recreational divers would be well served to have some of these skills and some of this information, before they consider themselves to have finished their training. There are not many places where it is taught in a recreational context. My husband has a "Techreational" class that does it. Fundies does it. Cavern, and Intro to Tech do, but I don't think you can call those recreational diving classes.