My friend and I used to joke about the link cable mode back in the day. We had the Doom Custom PS edition (amazing version btw especially at the time) and just thought it was funny you had to put 2 TVs (again now its easy but weight of CRTs back then) plus 2 games and 2 ps1s plus a cable just to play some DM.
The Saturn link cable was always more fascinating to me because of how little it was used (especially in the US). The only game I went to great lengths to test was Hexen. The US version has a debug menu where you can access a link cable coop mode. Its super buggy and even crashes alot but its real. I tested it years ago on 2 smaller CRTs and obviously now I have many saturns and a few copies of hexen. I always meant to do a video documenting it because so few people ever tried it.