The problem with that @Lardi is that the UK signed the treaty with the EU agreeing precisely that. The Good Friday Agreement expressly forbids a hard border between the Republic of Ireland and Northern Ireland, so the government signed in this agreement with the NI protocol, while telling everyone what a great agreement it was. Six months later and it looks like what it actually was - a hastly drawn up bodge designed to get the deal done, and now as problems arise in Northern Ireland, the government who paraded this as a wonderful deal are looking for ways to break it. For what it's worth, a few EU politicians warned that given Boris Johnson's reputation for lies and deciet, this would probably be what happened way down the line, and that the UK would shortly be looking for ways to ignore the deal they signed.
Sadly if you agree a deal and then start to ignore it, the other side will assume they can do the same. When Gove was talking about the easiest deal in history back in the day, it was painful to listen to - whoever sat down at the table opposite the UK was obviously going to want the best for the EU, but Gove told everyone that the UK would effectively dictate terms which the EU would be obliged to accept, regardless of whether they got anything in return. I can honestly say I've never seen a negotiation like that.
If there's a better way to sort out the question of Northern Ireland, it would be great. More than a few voices are now talking about a United Ireland a few years ahead, but that will be a kick in the nuts to the Loyalist faction in the North who kept the Tories going with their votes, and whoes rejection of every deal Theresa may brought back from Brussels lead us to where we are now. But the idea that the Uk can tell it's nearest and biggest trading partner to do one with no consequences is just silly. Joe Biden is now giving Johnson the same warnings the EU are. What you get when the PM is unfit to be a poxy journalist, let alone Prime Minister I guess.