It totally ruined a lot of people’s lives. They had plans to go work somewhere in Europe maybe even live there. Now they can’t do that.
The whole point of the European Union was it was supposed to be a bit like the United States without having to actually form a single nation. All of the countries would effectively act like States in one nation - they even setup Interpol to act like state troopers. Imagine if you suddenly couldn’t move between states. Utterly stupid outcome, and 100% predicted.
Just like any government the EU council did do some brain dead things, but that wasn’t a good reason to leave.
A good example of this is their insistence on using the comma, to mean “the”, “of” or “and”, leading to some bizarre headlines.
Which despite the fact it just sounds like a list of random words, is in fact a valid sentence. Or at least it represents one.