No. This is only true at the limit and maybe if we didn’t have ABS and Stabilitrac. During normal braking the tires are not the limiting factor anyway. If what you’re saying is true, then you could put brakes from a 1993 Civic on these trucks and it would stop exactly the same but we all know that’s not going to be the case. The Brembo are a massive improvement in stopping power under all circumstances.The only performance difference would be in heat management coming down a mountain on the brakes towing (or if you're riding the brakes, etc) - the limiting factor for braking distances is your tire's contact patch not the brakes (unless they heat-soak as above). Since the stockers are capable of triggering ABS you can't get better than that until you change the tires.
That said, the brake feel alone is enough of a reason to get them and so I'm heavily considering the fronts (don't care about the matching paint color for the rears)