They are genuinely terrified of a free-trading, global Britain that they cannot control or box in through stultifying regulations
Where is the evidence for this? The eu currently has trade deals encompassing one third of global gdp (and that was before the japan deal) most of these are on 'most favoured nation' terms.
That means that if by some miracle we find some competent negotiators and manage a better deal with one of these countries than the EU have, they have to offer the same terms to the EU.
It is simply impossible for us to establish better deals with that one third than those we have via the EU.
If we manage to identify a valuable trade partner outside those deals I'd expect the EU to notice and also start talking to them - who will get the better terms? the now 6th,soon to be 7th largest economy or the huge trading block that is the EU?
So much of brexiteer speak assumes the EU would stay still whilst we go forth and profit - why would they?
The stasis in the UK since the vote has already cost us over 2% in gdp growth relative to the EU - that will only get worse whilst this farce continues.
We do not have the option of not trading with the EU - anyone who does not understand that does not qualify to take part in the discussion. Any trade with the EU will need to meet their regulations - the suggestion we could ever be free of those again shows a basic lack of understanding.
Yes we could be a "global free trading nation" (though I thought we were - I've certainly worked in services over much of the developed world) but we would not have better trade deals - ipso fatso we'd be (significantly) worse off.