Political unity is absolutely necessary, now that there already is economic unity (more or less). In fact, the biggest mistake Europeans made was beginning with the monetary union, while there were (and still are) no unitary politics.
The days when a single country could pretend to be independent are over. I believe that today, multinational mega companies are more powerful and influential than any European country. It's absolutely stupid to give such megacorps a unified economic area to do what they want to, when at the same time European countries are still competiting with each other and have no standardized laws.
But I do agree that everything must be done to preserve the cultural diversity and different languages. That's what really defines Europe.
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