As someone who works closely with the FAA's UAS Office frequently, I can promise you you're wrong.
And while we don't have a lobby per se, we do have Drone Service Providers Alliance, Home - Drone Service Providers Alliance
you seem to be talking about 2 different things. The theoretical ceiling of a drone vs the max allowable altitude above home point
I've seen a video, of a Mavic 3 Pro IIRC, actually flying over Mt. Everest
the 500M/1640ft is a restriction of...