Some model aircraft flying at AMA fields have long been argued to require more than 400 ft AGL for performance reasons, but I cannot think of a single legitimate reason to allow recreational drones to exceed 400 ft AGL in any situation, let alone in controlled airspace. These forums have long seen repeated (incorrect) arguments that since manned aircraft are not allowed below 500 ft AGL, except for takeoff and landing, drones should have the run of the lower 400 ft. Part 101 was previously prevented from formally restricting drones to 400 ft, but now you want recreational drones explicitly allowed above 400 ft?
Since when have manned aircraft been limited to above 500’? ‘...that altitude where an engine out landinding can not be accomplished without undo hazard to people or property.’ And it isn’t just “drones”. Model aircraft/gliders have flown from AMA sites for 40+ years without incident. In the 30 years they have been keeping records, only 4 deaths have occurred as a result of AMA flying and only one of those was a spectator.