I think much about remaining was not known either. One thing that was clear was that a vote to remain was not a vote for the status quo.
But sure, it would have been nice to have been provided with more detail on what sort of Brexit we'd have. Perhaps the government at the time could have given greater clarity regarding that. Although, given the fact the government underwent a massive reshuffle, and the fact that the UK still has to negotiate terms with the EU, it might have been rather a challenge.