Sounds like each member was left to fend on its own. In that case you’re better off BEING on your own!
The EU is a loose confederation — not even a strong confederation like Switzerland (where each canton is in many ways independent), forget about a strong federation like the USA or Germany.
And this coronavirus showed that - as a loose confederation of independent states, with no common health policy, it didn’t do anything. Each individual, independent, country did as it thought best.
The EU is a trading community and that’s the best for it — if they follow your post they would then ask for converting the loose confederation into a country — that’s a bad idea.