Scarcely surprising. Given that there needed to be a customs/travel/ politic barrier once the UK wasn't part of the EU, the problem being where to put it. There are only three choices:
1) on the existing Irish/Northern Ireland border - tried in the past and no longer tolerated not least because any implementation would be at least a big a mess as the current Dutch/Belgian fractal border 2) somewhere in the middle of NI, say between Belfast and Derry or just outside the Belfast docks - both obvious non-starters 3) in the Irish Sea - never accepted at any stage by the DUPAll have fatal flaws, which anybody with half a brain would have recognised, except Boris and cronies - the people who proposed it and are now acting all surprised that its being picked apart. Cretins. Admittedly the EU apparat didn't help things by shovelling on all the regulations and documentation they could think of, but the *wonderful* HMCE and the equally impressive Home Office haven't helped, but that seems to be primarily due to incompetence and an inability to do anything by a known deadline.
Another given. Apparently their party system used to work, but now that its apparently following Russia's lead toward a self-appointing oligarchy it may be starting to totter.