Let's take just a moment and understand WHY there are essentially two different sets of rules. You can bet your bottom dollar it's not because the FAA wants it this way. Talk about a nightmare from the ground up (see what I did there LOL).
Back in 2012 (FAA MODERNIZATION AND REFORM ACT OF 2012) Congress agreed that model aircraft (hobbyist) needed protection from new laws (and I agree they did). That pretty much tied the hands of the FAA. Because of this act, which essentially created a Safe Haven for anyone who was strictly a hobby/recreational use, the FAA had to take existing and future regulations and carve out any portion that pertained to strictly hobby flights.
The irony is at that time almost all Model Aircraft flights were carried out at "Flying Fields" that were either far from air traffic or they had an existing Letter Of Agreement (LOA) with local airport that gave guidelines about where and how high MODEL aircraft flew. Model Aircraft couldn't fly themselves (Gyro's were only being used for helicopter stabilization at that time) and they could not navigate themselves (GPS was still too big and bulky). If you didn't know how to fly or ou lost control of your Model Aircraft it might fly a few hundred yards then start the Death Spiral into terra firma LOL. Now with gyro stabilization and GPS guidance you don't need to know how to fly the aircraft. You just need to know how to swipe your charge card, charge batteries and hit the TAKE OFF button. The Gyro and GPS will take care of the rest for you. This took Model Aircraft far way from the safe confines of Flying Fields and put automated, self leveling, self navigating R/C aircraft in every backyard, empty lot, building top, and parking area across the nation.
We get upset with the FAA for TWO sets of regulations for seemingly the same action. But we've got to understand that it was not the FAA who created the fiasco but our Congress fueled by lobbyists with very deep pockets. It provided protection for the hundreds of thousands of R/C Aircraft enthusiasts who have flown by the rules and performed millions of hours of SAFE flights for decades.