Then I would say your technique/muscles need to develop more and you have no place riding brakeless (I'm assuming). If your technique and muscle strength was great enough improoving grippiness of a tire would help you stop quicker. If you are confident in your ability to make sudden adjustments safely and have faith in your ability to stop when you least expect it then sure ride brakeless, until then throw one on and save your body and others around you, becasue you clearly are not at that point.