Re: The real lessons of Brexit
You are quite correct.
In a geopolitical context, the USA sees this split and is alarmed at this flexing of German strength especially with Germany making friendly overtures towards Russia (Ukraine & Nord Stream II as a couple of examples).
Conspiracy theorists would contend that Dieselgate, Hungsry's & Poland's ideological traumas with the EU, and Brexit are all part of an attempt to prevent the resurgence of Germany which has always considered Middel Europe as its fief (colony). Now it's German hegemony of Western Europe that needs to be completed: luckily for Merkel, Macron's doing it nicely. It makes you wonder whether some elections are "aided & abetted" to ensure an appropriate result.
One thing is clear, the .eu domain is a precurseur to far greater fireworks in the near future.