Be that as it may, events in Limerick over the weekend resolved one issue.
Whatever way things turn out in London and Brussels, there already exists on the island of Ireland one hard border.
And it lies on the north side of the city at a location known as Thomond Park.
More specifically, that very rigid boundary covers an expanse of ground stretching along the 22m line.
And the mighty Leicester Tigers found this out to their cost on Saturday failing to penetrate the stubborn barricade manned by the united nations of Munster.
So much so that legendary scrum-half, Ben Youngs packed it in after 55 minutes and called it a day.
He had enough of watching his Tiger team being swatted away as though they were nothing more than irritating flies.
Even a last-gasp surge to break through the border failed when CJ Stander plucked the ball, stuck it in under his oxter and that was that.
Stander, man of the match, is one of the biggest finds for this united nations Munster team.
Stander, a South African, lines out with another great import Tyler Bleydaal who hails from New Zealand.
It seems there is major rugby strife in South Africa as they can’t believe CJ was rejected by their national management after he was deemed not to be big enough.
And of course there’s plenty of home blood in the Munster side.
Away from the hard border zone, Limerick again demonstrated it has the softest of soft sides when it comes to opening its hospitality to visiting rugby fans, particularly those who travel across the Irish Sea.
Game over, the fun began as the Tiger fans were embraced by the whole of Munster.
Steve Herigage and his friend Benjamin Wheat said they’d heard a lot about Limerick’s famous rugby heritage. Despite a long day, the two builders were out having a whale of a time in Nancy Blakes, engaged with new found friends from Clonmel.
Steve said: “We left Leicester at four this morning to get a flight from Stansted to Shannon. The city is magic. There seems to be partying going on all over the place and then there’s this huge ice rink. Its awesome. It’s my first time, and while it was a bad day at the office we’re having a right old time of it. Just being here to soak up the atmosphere helps ease the pain.”
Dan Scannell, who has Tralee connections, travelled over with his wife Noelene and met up with friends Phil Brady and his wife Pippa who travelled from Monaghan.
Dan said: “We are all meeting up to get the Christmas celebrations under way and what a better way to do it than in Limerick watching Munster in such devastating form.”
Limerick-born surgeon, Michael John Lynch, who originally hails from the North Circular Road, also came over from Leicester where he has worked for many years.
“This result will give me plenty of ammunition to fire at my colleagues at the hospital next week,” he said.
Now as Munster prepare to invade Leicester next weekend, it will be interesting to see if they’re taking all this Brexit hard border stuff seriously over in Wellford Road.