Why not?
How will EU control Commonwealth citizens coming to UK and then proceeding to invade EU states with no controls. Or other banana republics we strike bilateral trade agreements with and remove visas.
EU learning from UK :idea:
Yes, it all seems a bit one sided, doesn't it? It takes two sides to make an agreement.
This is a very complex problem for the EU, which has 27 member states. The UK only has to fend for herself and she is making heavy going of it.