Of course I get that - which is why any post Brexit actions have to focus on increasing non EU trade over EU trade.
You seem to believe there's interest in EU for a deal that suits both. You seriously believe EU want that? They want to scupper Brexit, try to force a lousy deal. EU want to send a message to any other nation thinking of leaving.
I'm well aware many, like Corbyn, reject "no deal". That's a great negotiating tactic that, "we'll accept any deal or will cancel Brexit".
EU is very much on a downward curve; German economics dominating it and Merkel can't even form a government at the moment. When Britain leaves, others will have to step forward due to the loss of the net contributions. Can't see Germany being happy at having to burden that load even more.