It's a problem when other characters do twice the damage without them and they're not intended to be part of the game.
Also, online. 3frames buffer makes it very easy to find proper opponents online. 1F links is pretty much forcing you to play nearby players. Cool for you if you're american, the rest of the world doesn't have scenes and we'd like to be able to enjoy other countries players too.
That's flat out not true. Landing one frame links comes from muscle memory. 1 frame punishes are the problem for online, not 1 frame links