It’s not really an advantage though “flooring it”. For example, if I floor my car from a roll at 35 mph, it will drop into first at about 4000-4500 and take off. If I floor my car from 40-45 mph, it will only drop into 2nd at much less rpm and kind of lug until it hits 3000 or so. So if I race a similar car (hp wise) from 30mph, then turn around and race the same car from 40 mph, the results could be drastically different. There is no consistency.