The creators of A Way Out asserted that their split-screen prison break adventure would revolutionise co-op games. Perhaps it will - only time can reveal its lasting influence. But for it to reach that status it has to go up against the game which, for my money at least, perfected co-op almost Ten Years ago.
It's not just us that loves Left 4 Dead. See Fatshark's Vermintide 2, Holospark's Earthfall, and Ghost Ship Games' Deep Rock Galactic for evidence.
Shooting zombies was a tired proposition even back in November of 2008 when Left 4 Dead launched, but Valve imbued the project with their familiar brand of magic and, ten years later, there are still thousands of people regularly logging in with friends to chop back those same hungry, undead hordes.