> And while such borders might present new challenges after Brexit, there were proven solutions: non-E.U. Switzerland, for example, keeps its borders, travel, and trade open with four major E.U. countries. These problems only became “insoluble” when E.U. diplomats discovered they might be used to tangle up the Brexit negotiations.

Complete nonsense, just like the rest of the article. Switzerland (and Norway) are both Schengen countries, and even so, the borders are hardly "open". More importantly, the shape of the border is completely incomparable to that between Ireland and Northern Ireland.

The Irish border is the only blocking issue, all else heard from brexiteers is just misdirection.