I think you're misreading the interests and positions of the parties.
Giving the UK the shaft absolutely serves the EU's interest in deterring other members from trying to leave.
Further, the EU hardly needs an advantaged trading relationship with the UK, so they have little interest in sweetening any deal. In fact, major elements in both France and Germany wish for there to be no advantaged trade, at least in financial services, explicitly to steal that tax base for themselves.
The UK, on the other hand, desperately needs such an advantaged relationship and will likely face a choice between reverting the Brexit decision or taking a very bitter swill of vinegar, indeed.
Giving the UK the shaft absolutely serves the EU's interest in deterring other members from trying to leave.
Further, the EU hardly needs an advantaged trading relationship with the UK, so they have little interest in sweetening any deal. In fact, major elements in both France and Germany wish for there to be no advantaged trade, at least in financial services, explicitly to steal that tax base for themselves.
The UK, on the other hand, desperately needs such an advantaged relationship and will likely face a choice between reverting the Brexit decision or taking a very bitter swill of vinegar, indeed.