Broad appeal isn’t up to the developer’s imagination, it’s defined by the market that developer’s trying to sell to. For example, Minecraft. It’s a fairly good definition of broad appeal. There’s lots of different ways to play, both single and multi-player plus a very robust third party server community that offers even more ways to play for players across many ages. By comparison, Forza has a much narrower appeal. So does Dark Souls. And Cyberpunk 2077. Not saying that those games didn’t do well, but if you’re trying to sell into a market of just, say 150m, and you’re going at that with a driving simulation game, the number of folks that would possibly buy your game would be far fewer than if you attempted to create something more Minecraft-y.