The whole EU concept is insane.
I have good neighbors. Wonderful neighbors. Couldn’t ask for better. Nice to live next to them. But I don’t want to financially be tied at the hip with my neighbors. Why would I want to be involved in their decision making or finances? Why would they need to be involved in mine?
The EU was inspired by the US. 50 States, one nation, all that. But the 50 states speak the same language, have had a common currency, ethnicity, and traditions for 200 years. Europeans don't even all use the same alphabet.