I'd say don't let it bother you. If anything, it'll help the series. Hear me out:
My friend likes the Fire Emblem games, but never buys them because he's a perfectionist. If he's doing a mission, and one person dies, he starts over, and thus, he never got through the games. A game with an option like this will peak the interest of players like him, and then after he gets through the game, maybe he'll try it with the classic mode that all of us Fire Emblem veterans come to know and love. Making a slightly less hard mode while keeping the mode we prefer does nothing but help broaden a game's player demographic, and more sales usually means more titles, so it's a good thing.
My friend likes the Fire Emblem games, but never buys them because he's a perfectionist. If he's doing a mission, and one person dies, he starts over, and thus, he never got through the games. A game with an option like this will peak the interest of players like him, and then after he gets through the game, maybe he'll try it with the classic mode that all of us Fire Emblem veterans come to know and love. Making a slightly less hard mode while keeping the mode we prefer does nothing but help broaden a game's player demographic, and more sales usually means more titles, so it's a good thing.