That’s a fair point, however it’s hard to see the EU making an example when it’s so in its interest not to… Chances are they’d end up getting some hard proofs in terms of legislation commiting the UK to the EU for a lengthy time period and maybe some other “commitments” which don’t boil down to anything but look firm to members and citizens (as loved by governments everywhere who want to look like they’re doing things while also not wanting to do those same things)