No, but it is a big issue that involves messing with an agreement (the Good Friday Agreement) put in place to stop a bloody conflict. An agreement that is co-guaranteed by the USA and... the EU!

There's plenty of hard problems to go around, but this one is definitely incompatible with any peaceful brexit. Brace yourselves, Troubles 2.0 are coming.

But it's the only part of the problem where the "wrong" solution has a real risk of reigniting armed conflict.

I don't think they are, but it's obviously the biggest. EU want a sea border keeping RoI/NI open, UK won't accept the break up of their union.

In other words, UK wants to keep their union, EU wants to keep their union, nobody bothers to ask the Irish, as usual.

> EU wants to keep their union, nobody bothers to ask the Irish

I don't think so, no. The Republic of Ireland is the EU in this case. Or part of it, in agreement and solidarity with the other parts. There are plenty of statements from the ROI's political leaders to this effect.

Which is hilarious, as NI voted 'Remain'. However, I'm still not sure if it's time for a United Ireland. Still a lot of animosity between the sides.

I don't think there's any good solution: even the current one took over a decade to negotiate. Any territorial changes are unlikely to remain nonviolent - united Ireland, hard border, independent NI, it's all very explosive.