Don't think that was a main issue for many on the leave side, its why 'project fear' didn't work. Lots of changes around the world in trade matters will now have to be made because of Covid as well as Brexit , speed will be of the essence in many cases e.g. responding to emergencies, and it will be a case of first up best dressed, and don't forget the EU need 27 countries to agree on new deals/or how to amend existing deals (Covid issues) that will make the 'super-tanker' nature of the EU agreement processes more of a liability, what's the betting on the need to open up the majority voting issues?.
The UK will no doubt in some areas of trade seek to operate as an off-shore 'stack it high sell it cheap' player, depends on how much we can get away with. The UK has no Empire, but it does have links through the Commonwealth, which may well come to the fore, especially if the UK offers Commonwealth countries a better deal than the EU offers, who knows, certainly things won't be dull. The issue for the EU will be when existing trade deals come up for renewal, suspect Boris's plan is to play the long game and blame Covid in the short term for any losses.
He might just get away with it!
We're still trying to find out what the issue was with the leave side, and keep going round in circles trying to find out the reason(s) were. Apparently it's not foreigners, it's not sovereignty (always had it), wasn't unnamed bureaucrats ('leave voters don't understand how it works) not about borders, they always had control and not about trade, probably forgotten a few other imaginary issues, oh yes a measly 8bn a year to save many more billions.
All countries have Covid to face. Most countries are in a group or market of countries, including most or even all Commonwealth countries. Just the UK are on their own. Of course Covid is going to affect every country and for an indeterminate period of time but how does that change how countries are going to trade.
The still over-riding thing which still isn't being taken seriously enough is the proximity of the UK's biggest trading partners, the EU.
It will be taken seriously finally next year.
If the narrative to persuade the leave voters to vote to leave had been the following do you think the vote would still have been to leave:
We will rip up all trade agreements and have to start from scratch with every country in the world which wiill probably take many years.
We will severely disrupt all supply lines and risk many countries uprooting from the UK.
You will not be able to live and work in the EU as you have been or could have.
The number of foreigners will still increase but they'll be a bit more diverse in origin.
A border will be installed within our country and export documentation will be required to be able to receive from and deliver to that part of the country.
We abandon current standards and replace them with yet to be decided standards.
The value of our currency will greatly diminish.
There will be much more travel restrictions , holidays will become much more expensive as will your mobile phone bill.
Etc...
But you will now be able to buy 200 cigarettes at duty free rates.
Yes I know, they'd still vote for the duty free.