Finally a definition of RPGs!Dude, the reason you repeat sections over and over again in DS is because you died to the boss and have to get to him again. Which is common trope in ACTION GAMES which DS ultimately is. Kind of like playing Castlevania.
In an action game, you can only get through a brickwall by playing better. In a jrpg, you improve your character's statistics.
RPGs are action games with character stats as cheats for physically-challenged players included in the game as a feature!