FE8 also has infinite stat boosters and remains easy, even during post-game.
Yes, but fully leveling means you have to use less stat boosters, and that means you have to do less mind-numbing grinding for money. And as you said, FE8 is easy so it isn't like you need to promote before 20 anyway.
FE8 may be easy, but it's much easier if you don't arbitrarily wait until 20 for extra levels you won't need unless you're angling for max stats. --- The only thing more consistent than the Pats beating the Texans is my mother's regret she survived childbirth, knowing she spawned a welcher