So Dungeons and Dragons, by most counts the father of RPGs, is not considered an RPG by you. Once you reach level 20 there you have basically the end of your power advancement. Unless you are in a Monty Hall campaign. Then, you are still playing for things based upon the story. You can gain political power in your world, kill the big baddies threatening the world. But in no way is the game based upon that you continue to upgrade your "gear".