I think if he meant one standard like DVD and companies like Sony or Microsoft would make the dvd player. Other companies can join in. We would have choice and competition. And the one game would work the same on any device.
At least that’s my wish.
Most if not all game prior to like 2000 didn’t give you tutorials. I guess they were in the booklet that came with the game so not in the game.
Super Mario Bros on NES starting point is the best. Simple and allowed people to die repeatedly to learn what the game is about.