No, however it completely limits the potential for more powerful dGPU's. As stated the MBP will be stuck with mediocre dGPU's. Your missing the point completely, battery capacity has a limit to be allowed as carry on, Power delivery is simply irrelevant and now very much limited due to USB C.
Q-6
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Power supply, not battery capacity, there a distinct difference, USB C has zero impact or implication on battery capacity, however USB C is limited to 100W power supply, which with things as they stand leave around 35W - 40W for the dGPU, so nothing special happening anytime soon on that front with the MBP, while the Windows OEM's will continue to offer faster & more powerful systems.
Q-6