After decades of the single market, any EU country relies on at least a steady stream of freight trucks to keep its population fed, and fruit pickers have to be

After decades of the single market, any EU country relies on at least a steady stream of freight trucks to keep its population fed, and fruit pickers have to be brought in seasonally from other countries, because otherwise all that produce will simply rot in the field, etc. Completely closing borders would simply not be feasible without years of preparation.