And what exactly does the 1500 hours on some 20 ton cessna without a yaw damper, VNAV or a decent fms teach you about flying a real jet in a real environment? Nothing. You learn while you do it. Good instruction and capable captains make even the youngest first officers into capable pilots. You need to start somewhere for sure, but why start on a turboprop that has nothing to do with a jet when you can just as well learn on a 737 or an A320