No one, at least not me, is asking for 100% balance. What I am saying is that the "Well, you can't be perfect" is a really tempting go to, and often lazy, excuse for people to ignore existing issues with balance. Nintendo just released patch notes with various buffs and nerfs, so apparently they know that having good PR and publicly claiming their game is balanced is one thing, but taking steps to make your game actually balanced is another.
Atm, sword mains are pretty dominant and that's probably the way it's going to stay, because they possess everything - strength, speed, range, and little end lag on their moves. Young link in particular is pretty disgusting. The only real weakness are their recoveries, which aren't even *that* bad. I'd say they're average, with the exception of like, Chrom and Cloud.