>>725469798 (OP)
I can think of at least two games where easy mode is the actual hard mode.
>valkyrie profile
The game flat out doesn't open up 3 dungeons, which cucks you out of a lot of EXP (you can store it and give it to characters you acquire later on). One of those dungeons has the absolute best wizard in the game.
>kingdom hearts 2
Critical mode cuts your HP and MP by half and makes enemies hit 4x as hard, but it also gives you a LOT more abilities early on (a second finisher, MP haste, reaction boost, etc), and more importantly 50 extra AP to equip them all. Without accessories, on proud mode (the second hardest difficulty), you'll have 50 AP by level 50.