In regards to the overkill comment. There is a threshold for most things, that a certain amount is overkill.
Frankly, your ultimate stopping distance is determined by the coefficient of grip your truck has on the road. This depends on the coefficient of friction of both the surface you are on, and the surface of your tires.
Not to give a lesson in physics here, but fundamentally, if on dry pavement, you can stomp the brakes and induce ABS, or induce lockup for those without ABS, then you've exceeded the threshold of grip. Now, rotors and calipers are very simple. The caliper presses on the rotor, causing again a coefficient of grip, as determined by the friction, between the two surfaces.
When the grip of the rotor on the disc, exceedes the grip of the tire on the road, simply put, your wheel locks up, or goes into ABS.
Now, obviously the inertia and force of the truck as it travels forward, greatly effect the coefficients, but thats why brake bias is generally ~70% to the front.
In terms of Blazers, and S10's- they are not Mack trucks, nore are they even close to a full size. They do not require the amount of brake force provided by corvette setups.
It has nothing to do with traffic, if somebody cuts you off- frankly thats your reaction time, and how quickly your foot moves to the brake pedal. If you're a slow ass tool, then C6 brakes wont save you.
Now, conceededly larger setups avoid brake fade, and are more tolerant of temperature, but unless you're driving Laguna Seca in 110 degree weather all day long, you again don't require that capability of fade resistance.
I whole heartedly agree, that Bear and SSBC setups, even changing S10's to the blazer 2piston setup, will improve your stopping distance over stock, given you aren't running the narrow ass 205 stock front tires.
I also conceede that larger diameter rotors produce more rotational inertia, however the primary culprit of that rotational inertia is the 18+inch x 8.5+ inch wheel with the big ass spokes and thick rim edges.
All that said- if you are running an LS truck, or blazer as it may be, or maybe you have some really whacked mid engine twin turbo shitsubishi setup, and your passengers asses get hot from the exhaust manifolds, or maybe you've crammed in a 572 that hasnt sipped pump gas since it was installed- then perhaps, just maybe, you'd warrent a C6 setup for the performance aspect.
Maybe you really do circle track your truck, perhaps you're trying to compete in the truck series.
If the above were the case, I doubt you'd be running such heavy beefy setups. Unless you are very lucky and get to go around Bristol, and can actually break 100mph on the straights without going straight into the wall.
But by in large, most users of the forum, don't drive in a manner that requires such a setup, unless they live in LA... I hear the cops out there have pretty quick cars
So- why do it.
A: Because you have the money.
B: Because you weren't an idiot, and got some nice open spoke design wheels.
C: Because you think stock stuff looks, and feels like poo.
D: Because you want to be the first Sonovette.
and perhaps the biggest reason of all:
E: BECAUSE YOU CAN.
Now my personal take- since you all probably think Im jealous,
frankly, I'd love to do this setup, or even the SSBC/Baer setups, because they look damn cool, and I think the people who have done it, kudo's to you, I wish that GM would have made a 2nd gen Syclone style truck, or even that they would drop the piece of shit Colerado/Canyon, bring the S10 back out with a higher performance option, that had beefed up 4-wheel disc.
If people don't do it, and don't want it, the OEM's will never build it, why do you think they have reinvented the muscle cars 5x over, because people want it.
I love seeing S10's, and Blazers with big brakes, big pipes, and cool amenities, don't get me wrong its why I read this forum.
Ultimately, your grip on the road, your reaction time, and your decision making, will determine if you smash up your front end. I highly doubt that if Baer/SSBC brakes don't save you, that C6 setups would.