Dangerous assumptions there Hudson. Take Off performance in many aircraft is marginal in the stop case. You should use every avaliable means to stop the aircraft. How do you know that ATC are right, or even have time to not grab one of the 2/3 or 4 thrust reverse levers (and which is the right one) how do you explain the nice low speed overrun, say 40knots into the sea or off the cliff at the end of the runway.
And what about asymetric reverse? Could go off the side of the runway very quickly indeed.
The RTO has to be done right. As we are human its best to have one response for all times we want to stop, means less chance of missing something vital.