I think that in a hard stop that approximates what you have practiced, you can replicate what you have trained to do in your practice sessions, i.e. come to a stop withough locking front or rear.
Consider that the harder the stop the lighter the rear becomes, and the same pressure on the rear brake that is just perfect in practice sessions becomes enough to break the rear loose with more intense front brake. Muscle memory being what it is, you will tend to use the pressure you practiced using. So chances are good that you will only be able to brake without locking your tires at speeds you have practiced, and at the same intensity of front brake.
I agree that practice is what is needed, but you must practice at different speeds while progressively squeezing harder on the front and lighter on the back, and you must do this at speeds you are most likely to need it. Of course this kind of practice carries its own risk, so you have to weigh the risk vs. benefit.
The reality is that in a real hard brake situation you will squeeze the front harder than you have ever practiced, and even if you intend to use only the front brake, you are likely to stomp on the rear. Ask me how I know this...
