The issue with the EU is that they lack the capacity for any kind of strategic thought. There are multiple reasons why but the underlying cause is that it is possible to move into local minimum where there is a very strong disincentive for any kind of change. Countries in the EU have generally been in that place since before the EU...that is why the EU was created, to limit change. It is isn't political incentives, it is a fundamental aspect of the political culture. If you also look at the stuff that has changed, this only becomes more strange (i.e. government intervention, immigration, regulations). Change is limited to preserve control.