Nitro, from what I've read it has to do with the difference between a 1000 hour guy jumping into an RJ versus a 300 hour guy. The CFI has had responsibility, has had students put them in challenging and / or dangerous situations that they've had to maneuver their way out of, has had to make go / no-go calls. While taking turns in pattern in a 172 may not equate directly to airline flying, it provides aviating experience, leadership experience, and builds confidence and maturity. Your way does as well. The debate centers around folks taking the reigns of a jet hauling 50-76 unwitting souls without gaining any experience beyond gaining their ratings.