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It's currently irrelevant with current cards yes. Though they are also tuned to that bandwidth restriction. With PCI-E 4.0 and 5.0 both coming in quick succession I think there's going to be a huge ramping up of GPU's using that excess bus width. Though it still remains that both AMD and Nvidia have to start capitalizing on that to get the best out of their GPU cores. Nvidia being there just with the 2080Ti and RTX Titan and AMD not really there yet, though clearly if in a test scenario the Navi arch is capable of using it.Doesnt the 2080ti only just overwhelm PCI Express 3 x8 port and not by much?
Pretty sure it's somewhat irrelevant for a couple more years.