Switzerland is in the Schengen Area, and participates in the Single Market. We are proposing to be part of neither of those things -- indeed, we were never a part of the first. Comparisons with the Switzerland-EU border are facile at best. I just -- why do we keep have to rebutting this comparison? It fails on basic facts.
Also, whether or not the EU is worried about the border itself is rather less of an issue than whether or not the Republic of Ireland is -- and it is. And, as a matter of fact, the EU certainly should be concerned about how the Irish border works, because if it is held permanently open without some measure of control then that would undermine the integrity of the Single Market.
We've been into all this for years, and years, and years. It's sad that you *still* haven't paid attention to the real issues that open borders with the EU may pose.