yeah, all stock electronics. I came across the fusion line in a YT video yesterday, that's interesting for sure. I had thought about getting a more programmable ESC but hadn't really looked much at brushless beyond the price. $70 is a lot easier to swallow than a brushless setup from Spektrum, and having the esc integrated makes a lot more sense to me, since the brushless motors used in my industry ALWAYS have the ESC integral to the motor.
The stock electronics you have are really good. Could at some point use a better steering servo, but I would run it as is and dial in the stuff you have been working on.