If one caliper works, why do you think Suzuki spends all that money to have redundancy in the front braking system? Maybe the single caliper with upgrades feels better (you could upgrade the stockers and then it would be apples to apples) but the fact is it has 1/2 the power any way you cut it.You're not entirely wrong.
1 rotor changes the way you have to ride some of the time. But a single galfer with good pads and a properly serviced brake system stop as good as the stock squisky setup IMO. If I used my bike as a form of transportation I would be singing a different song but my bike is just for roll racing. The single rotor still has enough stopping power to pick up the back wheel if you just grab all the front brake and pray for the best.
Its not a mod I tell people specifically to do, and I went back and forth with it for a while with a few different members on here in posts even, but I got to the point I needed the 10 lbs gone and made the decision too. Having a bike that is 80-100 lbs less than what everyone else is riding helps make the brake issue not as big of a deal as well.
We rarely use 100% brakes and even the mushy stockers will send you headlong over the bars if you grab a fist full of lever. However, it is progressivity that makes brakes "good". Progressivity comes from having a lot of ultimate power and a good MC to control it. It's sort of analogous to a powerful stereo sounding better even at lower levels than a lower-power stereo that's working twice as hard.
So, I get why you have 1 caliper. It is logical for you and the reward merits the risk. However, It's more dangerous.