The Hyperscorpion looks like a lot of fun, and notice it has hydraulic brakes for considerably less, but the RR would still be more useful for me if I had to have one bike. I like the ability to haul a bunch of stuff without wearing a backpack, whether I'm going to the park to play sports, or to the beach, or just making a grocery run. Also, the RR has an adjustable seat so I can efficiently pedal it on the flat even if the battery runs out. I use my RW4 to workout all the time and my endurance has really improved.
Searching, I also found the Fucare Libra. It is heavier, but seems to be similar in spirit to the RR, sort of a utility/cargo frame. Can't say anything about the quality, and it doesn't come with hydraulics, but it is definitely more powerful for hill climbing or carrying a passenger and is a thousand less.
At least where I live, no one is enforcing the law with respect to powerful ebikes and licensing. I see kids and sometimes adults zipping by on the public streets on Surrons, which are basically electric dirt bikes, they don't even have the pretense of pedals. Most people ride in a respectful manner, even if their bikes are illegal. I think it is wise for Rad to sell bicycles that are set to be legal in most places in the US. What would be nice is for models like the RR and RW4 to have enough power and torque to keep chugging up steep hills when carrying multiple people or heavily loaded.