There has been a lot of mutual misunderstanding, I suspect.
I think I said here somewhere, that it really doesn't matter what the contract is eventually found to mean in law. The initial EU reaction was aggressive to the point of political suicide!
For 12ish hours various EU and European voices vented their wrath and fears in a way that was entirely unwarranted. Diplomacy, political expediency took a day off.
It takes a lot to make me say this, I am an ex teacher, but on Friday the most mature voice we heard was The Goviot.
That so many EU and European leaders spoke directly to and about the UK without, if what European posters say is right, including their own home nations, is quite unnerving. What was the point, what did they want to achieve?
All the "Oops! Sorry A.16 was an error" can't erase the fact that it was done, considered appropriate, for even a fleeting hour or 12. ROI and NI deserve better than that! Such casual treatment cannot be dismissed with "Oh, she wasn't here when that was arranged, maybe she didn't know".
It's a weird and unusual time. And I don't think anyone expected the EU to be quite so undemocratic. There are many European countries, EU member states that will have seems something they don't like!