Absolutely. Which is why May got a deal after all. Just not the kind of deal that people were expecting.
Which goes back to the OP and 'unicorns'.
The UK are asking for something that the EU could easily give and would be mutually beneficial, Like Trump, the EU want a win-lose deal rather than getting a win-win though for reasons of political expediency.
If there is a no deal, both sides lose out, but if the EU wants to cut off its nose to spite its face with a no deal then that's its prerogative, but pretending the UK is asking for a 'unicorn' is a bit silly.
If you have a car worth $4000 you really need to sell, but only 1 potential buyer who really needs a car and has the money, you should really be able to get a deal.
If one side says I won't pay a penny more than $3500, and the other says I won't take a penny less than $4500, both sides lose out and both sides shoulder some of the blame. Saying "It's my car so I can do what I like" doesn't negate the loss.
Even if you are pro-EU, it's hard to argue against the idea that EU is a wasteful, corrupt organisation riven with petty infighting driven by national self-interest.
For example, their own study showed having a Parliament in Strasbourg instead of Brussels wastes 114 million Euros a year (not to mention the environmental impact), but France wanted a parliament for reasons of national prestige so forced the issue and refuses to give it up.
The EU is not a paragon of virtue comprising noble minded individuals driven by notions of fairness and public interest, despite its recent canonisation by some (a general comment, not directed at you).
If given the chance, would it ?
Yes, they would have to.
Most certainly. It sounded as if you were blaming EU entirely for it though, but it was Greece that dig up its own hole in the first place.
Greece and the EU cooked the books to let Greece join the Euro. Being part of the Euro enabled Greece to borrow lots more money, and being part of the Euro meant Greece had its hands tied in its response to the GFC.
The Euro was a terrible idea from the start and was far more political than economic (hence letting Greece in despite the risks).
If Frank keeps giving Jessie lots of heroin knowing she used to be an addict, it's Jessies fault if she relapses, but it wouldn't have been possible without Frank so he must shoulder a good portion of the blame too.
I don't consider Switzerland to be much of an example for... anything. It is a small country and a tax haven. Whatever one learns from it, might not be applicable in a larger scale.
Article also discusses the former Yugoslavia. Anyway, the article is specifically about reducing scale to empower smaller, cohesive units of people. The idea is that human differences can't easily be removed, so we need to accept that and focus on building a system which prevents conflict. Conflict often results from one group fearing they will be dominated by another group, and chances are greatly reduced when both groups feel in control of their own destinies.
2 different views of how greater peace can be achieved with 2 very different goals (goal = direction of action not that they necessarily believe it can be fully/perfectly achieved), and acting towards one generally moves you away from the other:
a) How do we create a world where everyone likes each other so we can live as one big happy family?
b) How do we create a world where lots of people don't like each other but con coexist without conflict/violence?
a) is the dominant liberal narrative, but, imo, is a naive fantasy that disregards human nature and experience for ideological reasons. The rise of the far-right in Europe is certainly facilitated by the policies and actions of the EU, but they won't learn and will insist the cure is 'more Europe '.
If by robust you mean maintaining sovereignty, no matter how wrecked up the country ends up, sure.
Or maybe being the first to leave a sinking ship will prove to be the right thing to do. Only time will tell.