In the last 24 hours, the tone of the discussion around the border issue has changed.
EU spokesman Margaritis Schinas has come forward and stated that a hard border would be needed in a no deal situation. This comment was mirrored by the Irish PM, who added the caveat that it could be avoided if there were full alignment of both customs and regulations between the UK and the EU. And then Michel Barnier confirmed the same a few hours ago.
This was always known, btw, but the issue is so sensitive that those talking about it tiptoe around as if trying to cross a minefield.
It may help to reframe the problem to understand it more clearly: the Irish border issue is actually an "EU border problem". Namely, you have one EU country butting up against another non-EU country. And in every single case, either you have to have a whole slew of deals in place to erase the border (Norway, Switzerland), or you get a hard border.
In Ireland's case, you have the added complexity of the delicate nature of the peace process, the weight of history, etc. But it's still fundamentally another iteration of the "EU border problem". The fact that it's on the island of Ireland just makes it that much more vital that a sensible solution is found.
And that starts by being honest.
WTO is a complete red herring. It doesn't mention borders because borders aren't part of its remit, just like it doesn't mention knitting or golf. The fact that WTO is silent on the matter tells us nothing whatsoever.
When you dig into the legal situation of the EU, you quickly realise that a hard border isn't some optional, will-they-won't-they thing, but an absolute cast iron necessity.
It's healthy that politicians are starting to admit that truth, albeit with the greatest of reluctance. Because it's only after everyone understands the stakes that the real dialogue can begin, on actually solving the problem.