Try making speed without a control wire. It's beyond what most people can even imagine.
Monster truck tires turn into CD-shaped blades at around 50 MPH with only a few millimeters of contact surface. Foam tires obviously hold their shape, but so little friction makes it impossible to control. There is no way to get insane speeds like that without decreasing centrifugal forces of the rubber on the tire (not to mention amazing amounts of output and correct gearing from the drive system). You can do 8th scale buggy wheels/tires, but those have a very small contact surface too. Stopping or controlling a 14-16-pound truck over 50 MPH is impossible under the best circumstances, but much worse with buggy wheels.
That's one of the things that got me hooked on extreme RC -- trying to find the magic balance that makes for the best possible results. I found it (I believe) and that's when the challenge was partially gone making it easier to put RC "on the shelf" for the time being, so to speak.