Pulling a percentage out of my ass that can't be terribly inaccurate, 99% of police encounters with guns drawn the police are under 21 ft away, at which distance a knife is as dangerous as a gun.

If someone is less than 21 ft from you and they are going to be using a knifes against you, then you should still draw a gun just as often as if they had a gun. So at <21 ft you think guns should be drawn less because they have knives you should also be thinking guns drawn the ~exact amount less no matter which of the 2 weapon they had.