At its core the deal negotiated by both sides is a balance between:
- UK red lines (no single market/customs union)
- EU27 mandate (single market integrity)
- joint commitment to no hard border in Northern Ireland
Any credible solution cannot ignore these
EU27 mandate is unlikely to change. There really is no point to the EU without the single market. This is not ideology or philosophy, but hard economic and long-term interest.
There are 16 customs stations on the Swiss border. About 24,000 lorries cross it each day. Every lorry has to stop for customs declarations.
So far, UK/Johnson haven't done so. Spoiler: the reason for this is that there probably isn't one.