You have to remember that the EU was created in the aftermath of World War 2. It was built to eliminate war amongst a group of countries that had warring for hu

You have to remember that the EU was created in the aftermath of World War 2. It was built to eliminate war amongst a group of countries that had warring for hundreds of years. Making it easy to leave would undermine that. There is a procedure for leaving of course, as pointed out in other comments; that's what the UK made use of. There's no reason disentangling economies and legal frameworks that have been consolidating for more than half a century would be easy though.