I bought a Asus Strix Z370-E on ebay a little while ago for a good price as it had a missing pin. From looking at a schematic of the socket before I bid I identified it as a VSS voltage pin so decided to take a punt on it as no-one else was bidding. I have been using it and all seems fine, I am just curious as to what, if any, underlying problems you could expect with a board with a single voltage pin missing.