Institutional philosphy and systemics (USA - EU):
In the US, the House of Reps. has proportional representation of each state based on state pop, the Senate not (2 per state).
In the EU both the European Parliament + The Council have somewhat proportional representation - votes.
Hence the EU's model is not a US of Europe, is it?
If it was, then smaller member states (most of the 21 medium or small ones) would be better represented in the legislative bodies. Eg each would have the same votes in the Council or an EU Senate Upper House with 54 members would exist/be established.