Honestly, trim is a tool. If you can only dive in a horizontal position then you are fortunately stuck in a gear that can take you anywhere, but you are missing out on the joys of diving. Play is free and unreal as defined in philosophy. We make too many rules in diving which is another reason diving is defined as a sport. Diving used to be about looking at the underwater world. Now, it has become about looking at ourselves and others and judging performance. The best diver in the world is the one who is having the most fun. I think your son is learning that for himself. Nice!