When you make a game and plan on selling it, you're making a game for the customer, and especially for the ones you're targeting. They can play your game that they've purchased or happen to get their hands on it however they want.
It's then the job of the developer to see the different playstyles of their players, from casuals to normal to mid-maxers, and adjust the game and/or their new games so that they can maximize said players' enjoyment of the game.
#gamedev #gaming