One approach to learn a skill is to do hard things repeatedly until you get better. Whenever the current hard thing gets easy, you move on to the next hard thing. Once you beat Ascension Level 0 in Slay the Spire, you move on to Ascension Level 1; when you beat that, level 2, then level 3, and so on.
This is hard to do consistently. The experience of doing hard things can kind of suck. The image of Sisyphus comes to mind; you roll the boulder up the hill doing the hard thing until it gets easy, but it rolls back down – you start over with the new hard thing.
Does the experience have to be experienced as sucky (unsatisfactory) like this? I suspect the answer is no, though I couldn't say specifically how it could be experienced otherwise.