another reason, there are some setups not truly made for brushless, Like the traxxas summit. Soft long throw suspension without swaybars and overpower do not mix
That is understandable, but I would think you get a low KV brushless system, that is not putting out the power but the torque, power it according.
CF Ofna GTP II Extended Chassis Castle/Flux 2200kv 6s
CF Ofna DM-1 Pro CC1717
CF Sportswerks Mayhem ST
CF Losi LST2