It wouldn't be difficult to justify, lore-wise. Consider Shadow of the Colossus. Imagine if you started off with a bunch of superpowers and set off to kill the most powerful bosses in succession, but that black mist/affliction/whatever stuff took away one of your superpowers in addition to making you look emaciated. By the end, you'd be fighting the weakest boss, but with none or few of the abilities you relied on to take down the bigger baddies, making it your greatest challenge.
If the enemy strength slowly decreases (or stays the same) over time, but your strength decreases quickly, it keeps the player's power-to-challenge ratio continuously rising and ramping up, just like a regular level-up game. The power gets new players hooked, and the challenge keeps veterans around... It's a brilliant idea, Yahtzee.
If the enemy strength slowly decreases (or stays the same) over time, but your strength decreases quickly, it keeps the player's power-to-challenge ratio continuously rising and ramping up, just like a regular level-up game. The power gets new players hooked, and the challenge keeps veterans around... It's a brilliant idea, Yahtzee.