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Honestly, I'm old enough to remember how it was before EU and I can't imagine going back too that.
The main issue i see is the euro as a single currency. Individual nations cannot modulate their monetary policy according to their needs.
Most other stuff is okay.
[1] https://courses.lumenlearning.com/suny-hccc-worldhistory2/ch...
In this case, the 'small group' is the unelected European Commission (EC) bureaucracy who is desperate to retain power at any cost.