Moreover Ireland is showing a willing to extend article 50 to help the UK out
That limits the types of deals open to it and the EU has offered terms based on those redlines.
It has also said if the UK changes its redlines, the EU can change what it offers.
The Swiss model is basically a messy EEA and the EU does not want to go down that route again which is its choice
It undermines an international agreement the UK chose to enter into to build peace. That is the Good Friday Agreement