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The additional gear's primary purpose was for fuel economy. It also has some minor performance benefits in overdrive, but unless you're driving on the Nurburgring it isn't going to make a real difference.
Both transmissions will always have a 1:1 ratio in 4th. So the 3 gears that matter most for performance are gears 1-3. For these gears, any ratios you can put into a TR-6070, you can put those same ratios into the TR-6060. I'm betting the ratios we already have are close to optimal for the Camaro. So including those same ratios in the 7-speed isn't going to provide any benefit.
On the side of fuel economy, the benefit seems to me to be more for gov't fuel economy ratings. Think about it. You'll spend 99% of the time in the highest gear on the highway. When cruising on the highway, most people don't shift much. Whatever the optimal ratio is for cruising on the highway could just as easily be included in either transmission.
Like I said before. I'd have no issue with the inclusion of the 7-speed, but at the same time, I don't think there are any significant benefits either (at least for the consumer).
From GM's perspective, a slight improvement in the fuel economy ratings (not to be confused with real world fuel economy) would probably be worth considering.
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