Because you wanted to bring something that actually mattered to performance in order to make FLOPs look better....
Memory bandwidth = important.
FLOPs = Dick length contest that means nothing in real performance.
Really, nothing aye.
Given the same architecture, and a game that is not limited by outside factors (fill rate, memory bandwidth) the GPU with MORE flops will translate into a faster framerate
As I said it means something but it is hard to quantify.