Exactly untill the EU agree a trade deal with the UK instead of silly demands etc how the hell do you sort Ireland out?
That's the point many of us are making to you pro brexit people. That seemingly brexiters don't seem to have a solution at all.
The difference between Britain and Ireland in relation to NI to say your example earlier about France and Switzerland is that the relationship is not the same as in Irish people in the north can if they wish hold Irish passports and therefore cannot be restricted from going south and vice versa.
You have to therefore consider immigration options for citizens based in the north. Or special exemptions. Either way you have to have some sort of idea how to police it and control it without perturbing the people
Something May and her government have never considered nor have the pro brexit people.
You cannot even use schengen as an example due to relationship issues.
When we leave there will be no freedom of movement on on a work visa basis it will be the same in all UK ports,and a
airports - not a freedom of movement as we have now get used to the idea - Ireland will have a clause were it is one country like it always had before and after the troubles - there will be no hard border!
You know that's not realistic right? How has that worked out for Australia, the US, mainland Europe or any country with no physical borders and no seemingly constructive way to stop people simply walking over its border.
Employers in certain industry's will always hire cheap labor under the table (construction, farming etc...)
In some countries they spend millions on agencies to combat this as in hunting them down and checking that companies are compliant etc...