Because gameplay is what matters the most in video games. If you want just the plot there are movies for that, but gameplay is what separates games from movies and is the most crucial part. We have stuff like Fortnite, Minecraft, Rocket League, R6, PUBG, COD Warzone, LoL etc., all the sport games, all the mobile games, all the web browser games, and so on, without any story and narrative at all, just pure gameplay, because just like
01011001
said, games do not need any story at all.
Just look back at how everything started with Pong, Tetris, Space Invaders, Pack-Man, Mario etc. Sure, the games had evolve greatly since then, and some games try to be more ambitious with their storytelling than the others, because why not, the possibilities are all there, even more so than in movies given everything is virtual and it's only you own imagination what's the limiting factor, but still, even to this very day, the plot isn't necessary at ll to make a great, fun game, while at the same time, even the best plot and storytelling don't matter that much if the gameplay isn't good/fun in the first place and people drop the game even halfway through it.