[... not sure about 'nit dupport'. Never mind ...]
Interesting 'logic' in play, here ! I must surely infer from your post that you think the EU is required to see things, just as British Brexiteers do !!
The mind boggles. Can you really not see what's wrong with that picture ??
I've already explained 'why' the EU should've been, at least, receptive to the Chequers proposal. Because, obviously, it represents a negotiating position which has elements favouring the EU. Because it represents a move forward, instead of perpetuated stagnation.
That's why.
The EU didn't even see fit to give a detailed rebuttal to it. Just an 'it won't work' declaration.
I don't think the EU ever will offer us any deal we can accept ... very possibly, they'll end up offering nothing (blaming us, of course, not them ...).
At this rate, our walking away is a matter of 'when', not 'if'.