Dunno. My impression is that with the EU, we pick its suboptimal parts and compare them to what they could be with optimal execution.
We don’t look either at the successful parts, not at the world where it is wholesale gone. My gut feeling is that EU members are, on the whole, much better off for being in than out. One natural experiment is the UK - opinions differ, but the drastic accumulation of problems coincides with Brexit timings.
I’m all for improving the EU! And for sure there are bad bits. But when your car AC is doing badly, you don’t write off the car. You try to fix the AC…