Let's say you want to implement welfare state policies but you realize you need to change ECB statute since it can't fund public deficits like in every other sovereign nation or federation. How do you change that?
People think you can change the EU with European Parliament elections, but instead the way EU institutions like ECB works can only be changed with unanimity of **national governaments**.
This means states that benefit from a mercantilist policy (Germany) will never allow to change it for the sake of other countries.
Same of a lot of other important issues.
Also, the European Parliament is the only parliament in the world history that has no legislative power. The European Commission (sort of governament/administration) has that power and the Parliament can only block (and not always) the directives (~laws) by the Commission.
The EU is not a democracy for technical reasons.
