I think it's no secret that character development, the acquisition of new features and other types of improvements are present in almost all modern games. And not only in modern ones https://epiccarry.com/us/boost/buy-bfa-mythic-dungeons/ And what? Because the players love it. Increasing some important characteristic or acquiring a useful ability is, of course, not a victory in the final battle, but still a step forward in passing the game. And in general, it's nice that you can do something faster, stronger, or something that you couldn't do before.