But then you get different atoms if you cut different ways - well-defined that ain't.
Maybe you should stop and think about what you are doing: You have a goal that you want to achieve, a position you want to promote, and now you're thinking up linguistic arguments to attain legitimacy, justification for your ideas.
I'd suggest you start with the arguments and see where they take you instead. It'll lead to fewer contradictions - and you'll like the results you'll get better than the nebulous notions you espouse right now.
This is good advice.
At the moment I'm just putting my thoughts out there, acknowledging difficulties I face when they come to me. I'm not going to go into government or become a policy maker so I'm not worried about getting things wrong, nor am I claiming that everything I say as gospel. I just know that out of these discussions my views will be tempered and strengthened or readjusted.
Now that is nonsense, really. There are many nations much bigger than 5 million.
When I've been looking at "nations" and things that I might potentially consider to be a nation, it's very rare that I would find one that's much bigger than the 5 million sweet spot. England would be one; numbering at around 50 million or something. Poland wouldn't be far behind; even sans Silesia and Kashuba you're looking at 30 million+. Occitania might be another, numbering at 15 million. Castile would be about 10 million +, so would France. Bavaria is also pretty huge when you add in the rest of Bavaria which may currently be a part of Austria, so that would be potentially 20 million. That said, it's far more common to find things like Brittany (4 million or so), Normandy (3.5 million or so), Scotland (5 million or so), Ireland (6 million), Wales (3 million), Wallonia (3.5 million), Catalonia (7 million), Valencia (5 million), Galicia (nearly 3 million), Andalusia (8 million), Basque Country (about 3 million), Arpitania (unclear, judging by Romandie + the rest probably 3 million), Frisia (potentially 3 million judging by what I've seen), Alemannia (about 7 million, counting the so-called Swiss Germans and Baden), Lower Saxony (about 7 million, even including parts of the Netherlands), Franconia (about 3 million +), Venice (4.5 million).
I'm somewhat concerned by the bloody enormous size of England in this model. England would end up being one of the biggest countries in all of Europe; this is where federations come in handy. Russia would be pretty enormous though.
From what I can tell, under this model the biggest countries in Europe would be England (50 million), Ukraine (45 million), Poland (35 million +)... I can't even tell how big Turkey and Russia would be. Turkey would certainly be very big, potentially a rival to Russia because even without the Kurds you're looking at 70 million +. Germany seems like it
should have some kind of enormous nation lurking within it but I can't actually find it. It's as if everything is beautifully even and spread out across the states. Why is Germany so good at everything? Even population spread. Damn. Then again, looking at Italy, we've got something similar going on there too.
Just because there are sub-national identities doesn't mean they overrule the national identity.
I would argue that most overall "national identities", which could be described as meta-identities, like Spanish, British and German may actually be counter productive. I am on the verge of not considering them "real" or legitimate; that they just get in the way of the realisation of the potential of the nations within them. Obviously I'm not going to impose this on someone as I'm not some kind of military commander ploughing through their territories, everyone is welcome to have complex national identities of their own which can include these things; I'm just talking about how I see things.
Also I think you're underestimating linguistic differences, where I live there are even tiny differences between dialects in towns a few kilometers apart.
I know this, it was once the case in Scotland. That said, I do not consider dialectal differences to be sufficient to prevent nationhood. Most linguistic nations are just collections of dialects within one family.
Then you're underestimating other nation-building factors besides language, like common culture and common heritage/fate/history (the German word Schicksalsgemeinschaft sounds a bit martial, but fits), stuff like geographical/historical/religious divisions etc.
Originally I was deliberately getting rid of those in a bid to reassess how Europe might end up looking. As I said earlier however, that's how "Scotland" is united as one country. This is one of the problems I have. At the moment I'd prefer to keep religion/history out of things and focus on linguistic divisions and see where that takes me, as Helgoland recommended, rather than trying to build a strategy around what I want.
A country is not a nation or vice versa. There are plenty of nations that have no country of their own, and there are plenty of countries that aren't nations (like pretty much all former colonies).
This is where things get problematic. The definitions of "nations" and "countries" are incredibly problematic. I tend to define nations and countries as one and the same. Anything else is purely political i.e. states.