While I agree in principle with what you are saying there is still the problem that there are alot of us on 72mhz. We still need to be sure what that other person is doing. While it's great that you are flying on safe frequencies how are the rest of us to know? I see a couple of problems with your scenarios. First you are flying in a public park where you could easily hurt someone that does'nt know or understand how dangerous what you're doing is. You should be flying in an organised r/c club that has a designeated flight ares and where general safety guidelines are observed. Do you have AMA? You should, period. At a r/c club you should be required to still peg up to show you have ama and that you are observing club rules, not to mention that there might be a limited amount of flying stations and you should wait your turn if need be.

Spektrum is the future, granted but that does'nt mean you don't have to not worry about the person on the other side of the park.