I wouldn't say I'm in the mood for discussing it. I left that behind a long time ago because it is the most circular of arguments with extremely entrenched positions that the passage of years doesn't appear to soothe. The fact that some people are still here regularly, and still at it, proves the point. Nowadays then, I usually restrict myself to correcting absolute rubbish as I felt compelled to do last night concerning the food shortages which are due to sustained adverse weather in Southern Europe and North Africa, and inflated energy costs. I don't want ulcers so I keep out of this the rest of the time.
To answer your question though, and since you ask so nicely, Johnson's deal was never the finished article. He signed it in a dash leaving loose ends, and he concealed the fact which has led to it becoming a running sore. I don't think that this was unknown at the time - I certainly knew the shortcomings - but everyone had had enough and just wanted to "get Brexit done".
I don't have a lot of time for Johnson generally. He was never even a genuine supporter of Brexit. Let's face it, anyone who agonises for a whole weekend as BoJo did over whether to support leave or remain is hardly a true believer. We develop deep convictions about weighty matters such as this over decades of experience; or at least we should. He was doing what he always does - opportunistically looking after Boris.
However, in this instance I can see where he was coming from politically. Somebody had to do something to overcome the treachery of the 2017-19 Parliament where Soubry and Co, aided and abetted by Bercow, were employing every trick in the book to frustrate the referendum result. He had to have something to fight the 2019 election with, and this was it. Grudgingly, I have to admit that there was seemingly nobody else on the stage who could deliver what had been voted for. To this extent the end justified the means and his place in history is assured.
How the background developed around the Good Friday Agreement and the undermining of nation states by Brussels over half a century is a whole separate debate that probably won't see the light of day until the EU is consigned to history.