Well, a better question is: "what is in the PIX/ASA for dynamic routing?" The answer is "not very much."

Cisco's current design for the ASA is not going into a heavily routed environment. If you want to do that, you'd have to sandwich their ASA between more capable IOS-ish boxes. Or, go with FWSM in a Cat switch. Certainly, the ASA/PIX is not even a shadow of the incredible routing in IOS---features, debugging, protocols, manageability, etc.

Some of this is probably a self-fulfilling prophecy: because routing sucks, people don't use it. But that's clearly isn't valid across Cisco's security products, because the ISR is both routing-studly and security-featureful (although not as much as the ASA/PIX, obviously).