But it's also a TRAGEDY for the EU. They've lost one of their principal contributors, as well as prestige and status. This is generally not talked about.
The EU are negotiating HARD. Why? Because they are in a position of weakness. If they were in a position of strength then they would let the UK go easily.
Everyone knows this.
The complications are that the UK political establishment and business community don't actually want to leave the EU. Hence the desperate attempt by UK negotiators to keep as much of the old system as possible, to the anger of the proletariat.