Do you want realists? Or Pessimists like yourself?
Realistically, we have no idea what steel being strong against fairy will do. Last I checked, only Lucario, Scizor, and Jirachi were any good and of those only Jirachi and Scizor run steal type moves, since the type is rather weak offensively otherwise. Iron Head/Tail garchomp? Please.
You have no way of knowing whether those will affect anything outside of just in-game battles.
Only 1 per team, no item, and we don't even know just how big their stat increases will be, yet they're already broken? Seems more like Gamefreak is trying to boost some of their old mediocre pokemon so they can still be relevant after the power creep trend started in Gen IV. .