So WHY do I have to purchase a 6 pin to 6+2 pin dual pcie power cable splitter only to recombine the power inside of the GPU???
Wait, are you trying to power a graphics card that requires 2 connectors by splitting a single one?
While it's true that PCIE connectors can deliver far more than what they're specced for, I don't think going 100% over the spec is a good idea. There's a reason the card needs 2 connectors.