that's kind of just semantics, though, because they could give the shine 10 frames of startup and then it wouldn't be able to do many of those things, and then it wouldn't be broken, you might call it simply overpowered, or might call it decent or even bad. With enough changes, any character or move can be taken from the best in the game to the worst in the game and back again. Some people call things "overpowered", some say "broken", some say "stupid", it's really all the same, or at least people mean the same thing when they say that kind of thing.
The problem lies when people start throwing those words at characters/mechanics they don't like without actually thinking about it. Fox's usmash is one of the strongest in the game: does that make it overpowered? Someone's usmash has to be the strongest in the game. But looking at Fox, he has tons of other tools in his arsenal that compliment the usmash - are those tools overpowered, or is it the usmash? What if Fox is the right kind of power, and everyone else is underpowered? "overpowered" and "underpowered" imply that things are not the way they SHOULD be, which is very different from being the "best", and tier list discussion should not be about balance changes, or what is "overpowered", it should be about what is the "best".