No, it's not because it's art, it's because it's okay if all websites look the same, but regarding games, mostly 1 or 2 or its kind will survive, the others have to innovate or will be seen as sub-copies. On top of that, the complexity of making a game makes it so that it's more "coupled" to the hardware, so it's harder to generalize. If you want more component, then you can use the assets store, but at some point you will have to put in some work if you want your game to not be considered as a shovelware