The EU has its eastern borders with non EU countries (as well as with French dependencies in Africa etc.), where the flow of trade seems to function perfectly well with no talk of a back stop. This just goes to prove that the Irish backstop is a made up problem to stop the UK from ever leaving because they are scared sh*tless of the UK being a successful independent country. I cannot understand why anyone sides with the EU over this. Why is the EU so worried? If they think their system is so great, why would other countries on the mainland want to leave?
If the EU want to erect a hard border after Brexit, then let them do it on their side. We do not have to do it on the Northern Ireland side ( because, guess what, we can make our decisions after Brexit!), but can continue to use the border processes the EU uses on their eastern border for trade. Let the EU explain why they think there needs to be a difference, when the UK already has full regulatory alignment in place but countries like Albania do not