Don't get me wrong. I'm OK with a young Parker. It's just that I don't see why he has to start out as high-school age. They could introduce him a year or two after gaining his powers and enterning college in NYC. He'd still be green and learning but a 18/19 year old Parker fits much better into the MCU Avengers then does a 15 year old. The types of coming of age stories told in college years are just as, if not more interesting to general audiences then high-school. You grow him into an adult on screen from that point on instead of retreading the same stories we have recently seen.