So an aviation GPS is not dangerous so long as you use it in the cockpit next to the avionics?
I think you are presenting your own personal views as the views of the industry. They aren't. There are plenty of commanders who will be quite happy,
if asked, for GPS units to be used in the passenger cabin.
There are also a small but growing number of operators who actively promote passengers bringing their own WiFi transmitting equipment on board, to use with their WiFi service.
In a few years from now, low power transmitting devices will be commonplace. A few people will be left grumbling that "it wouldn't have been allowed in my day" and the rest of the world will move on.