The EU is too big for its boots and is unmanageable.
The euro is managed separately to the EU.
the EU has a management structure that is still a work in progress and relies on the collective inputs of the member states.
Much like the USA does.
China and Russia are perhaps larger in most respects, But each have a virtual dictatorship.
India has a central and state system that seems to muddle along year by year, but not exactly a role model for anyone.
China is the only world power with a long term strategy, and the means to see it through.
America has an inbuilt power paralysis and never has had a long term strategy, as it moves in four year bites.