I can't say that I know anyone* who was sufficiently knowledgeable to vote three years ago regarding economics, tariffs, trading agreements, WTO terms, the EU and the ramifications of leaving it. And you only have to witness the TV interviews with members of the general public in the street to realise that the average Joe merely speaks in extremely woolly generalities and knows diddly squat about the subject whichever way they vote/voted. And I don't think much has changed.
*Me included.