What is happening in the computer space is that everyone is clinging to an old style of doing things, likely because it is free and open, and suggestions to move to new connectors get saddled with proprietary licensing fees.
D-sub power connectors have been around forever (they even look like the '90s still) and would easily be able to power even future monster GPUs. They screw in for a strong connection too, but no reason you couldn't make ones that snap in too.[1]
[1]https://i.ebayimg.com/thumbs/images/g/A0MAAOSwYGFUvkFg/s-l50...