I think both sides were clueless has to how leaving would impact us all. The mess of the borders never crossed my mind and I don't even remember them being discussed let alone solved.
There was definitely no talk of food or medicine shortages that I remember but maybe I missed them and people thought not having them a small price to pay for independence...or perhaps they are part of project fear and won't happen.
I don't think either side really knows because stay or leave the EU is still calling all the shots.
I see Nigel Farage has secured German passports for his children after fighting practically his whole political career for UK to be independent from Europe. Is he now not planning on staying here now we are leaving?