A potential upside is that because it's tedious, you'll probably want to do it for only as long as necessary before trying again so the difficulty is somewhat a

A potential upside is that because it's tedious, you'll probably want to do it for only as long as necessary before trying again so the difficulty is somewhat adjusted to the player's need, and you don't actually change how enemies behave - the mechanics of the game are still the exact same, your numbers are just a bit bigger. When I imagine an easy mode I would figure making changes for how things work would be necessary, like having a boss' attacks be more predictable.