As is evident with everything that is happening now with regards to supply issues, while borders closed didn't have a direct impact on individuals at the time, it will have an impact further down the line as supply issues stack up causing all manner of issues, that issue is compounded further by the fact people have been essentially on an extended holiday for the past 18 months in many industries and have come to realise that working 70 hours a week sucks and they would rather spend more time at home with family. The current HGV driver crisis has been decades in the making with pay and work conditions getting worse by the year up until now when those frustrations have come full circle and have now started to bite us in the backside.
Blaming everything on the current government and/or brexit isn't going to solve anything, I see lots of people quick to blame, but no one offering solutions. Cancel brexit and sack the government isn't going to solve anything, that's just passing the buck to the next person.