I have a friend who do not like to learn. For him, if the game stays unchanged, is happy. All he want is to play together with his guild mates.
Other people want to have chalenges and variation. To see new content. Developers cannot create content (for free or for money) at the peace the player asimilate it.
But you have always the choice to play more games at same time.
Actually you must do that! If you call yourself a gamer!
Don’t waste your time playing over and over the same content which you do not like.
Why would you do that?