Not THIS negotiation, where the impact of not having a deal is far worse than doing what you consider a 'bad' deal. If you don't think you're getting a good deal buying a car, you walk away just as you are today. If we walk away with no deal, we're screwed. If you can't see that, then please don't quote any negotiation tactics at me again, please, because it's pretty clear you don't know the first thing about it.
Nobody wants a no deal, but the point you're missing is that the cocky EU need to believe that we will walk away with no deal. That means we seriously plan for it, just in case.