You catch me in a typical overstatement - "good people and the process will take care of itself." is potentially dangerous.
I include the project manager in the "team", which some readers will not.
I give an example: Dave A Thomas of Object Technology International told me back in 1992: "I hire good people, give them good tools, and leave them alone." In 2000, he told me, "Some people deliver, some don't. I hire those that have." The point with OTI is that they cheat. Eric Gamma works for OTI (started the OTI Zurich grouP - whatever team Eric Gamma put together doesn't need a RUP or similar process - they all know what success smells like, when the requirements are too vague and need to be improved, ditto the design, ditto the
testing, ditto the tools, ditto the planning, etc. So they go by intuition, smell and reflex - - - because they can.
Not every team has that luxury (ergo the cheating phrase).
Every team should have someone at that level on the team, though, someone who's done something similar before and can tell when the project is on track or off track. That person is called the "team lead" or "chief architect", and it's that person's job to sense those things