Hi. Sorry for my bad english.
I understand rules, but at this moment (according that, faa rules, maybe different to each country, american, european....) we are discussing about 500m phantom 3 limit (height), and it´s more that allowed 120m (400´). But there are threads about "range" of p3 over 1.2miles... when we only can fly within visual line of sight at all times. Then, drone future will be a long limit 800´, and 400´ height. why 2km or more range when a phantom vision (old) would be ok for visual line of sight?
I don´t like imposed limits, but I think, some times, they can be overcome. 200m, 300m, 500m or 550m. Some beautiful mountains have vertical walls over 500meters, and I think, flying there near to a mountain wall at 400m could be secure. I think... and it´s my opinion.
Regards