I always personally thought that "ROAR approved" items (motors, escs, batteries.) were limited, as in relatively limited performance and power, cause to be roar approved it has to meet a bunch of racer specifications. ROAR doesn't race 6s or anything higher than 4S (I think?), and they don't focus on power or performance as much as general racing.

Or, in other words, the motor/ESC that was ROAR approved would obviously not be much more powerful than other items that are roar approved, just slightly tweaked (settings, etc.).