Well it is, and ought to be [at least as far as what federal means in the modern world].
One-size-fits-all rules don't even work well in individual countries, so being skeptical of that approach to bind a couple dozen widely different countries together isn't "hysterical," it's vestigial traces of intelligence. (Especially with the benefit of hindsight, and that whole 50% debt write-down for Greece... real EU success story, that. )