[espadrine]

Another way to look at the Northern Ireland precedent, is that a compromise was found. People could argue that the same text can be reused.

[Milner08]

The text they are currently trying to rip up against the will of the EU? The only viable solution is that the UK rejoins the EU or becomes subservient to it... but neither will happen anytime soon.

[consp]

You do realise that the UK is trying to break that NI protocol unilaterally? That is a very poor example right now.

[KSteffensen]

A compromise that Johnson is now unilaterally reneging on. Apparently somebody figured out that it is actually the same compromise that was rejected when presented by Teresa May. No workable solution has been found for Northern Ireland.

At least England/Scotland border doesn't have the bagage of the troubles, but it'll still be a mess.

[thrwyoilarticle]

In addition to the other points, the GFA was used to create a democratic starting point for Ireland and Northern Ireland to decide their own future after an antagonistic history with Britain. Even without Brexit, that process hasn't ended. It's not a desirable end-goal.