The mismatch between the existing monetary union and the lack of fiscal integration (ie, not even any imaginary authoritarian eurofederalism) indeed is the economic macro issue above everything else, and remains a major unsolved tension even after the acute years of the Eurocrisis. Basically, if you take it as described, we're in a highly suboptimal state with two radically different directions to go to try to fix it. Politically, it's a nightmare, at least in terms of having much hope for sensible public debate and deliberation, let alone giving politicians the potentially necessary wide room of maneuvre.

I wasn't aware of these things back then, but I've been sad to find out it's not like we weren't warned about exactly this way back in the 90s when the crucial first steps were taken. Including by Paul Krugman, of all people!

Of course, it was the 1990s, from "Winds of Change" to Western neoliberalism as the End of History. And the elite belief in integration advancing "one crisis at a time" was well-established by then. Easy to say now, but did they really think public debt crises and bailing out national governments would create better conditions for having a mature discussion about EU-level fiscal transfers and taxation without drawing in the worst of our national stereotypes and trust issues, zero-sum thinking, and widespread beliefs about the Brussels bureaucrats completely detached from the realities of the common man, issuing directives about the correct curvature range of cucumbers while shoveling regional aid funds to smooth-talking Neapolitan gangsters to promote more sustainable EU waste management strategies, or whatever?