There is no clear vision or advance warning of what leaving is or what it might be because there is no detail in Article 50 of the Treaty on European Union (or Article 218 of the Treaty on the Functioning of the European Union). From Article 50, it all sounds so simple, until a member tries to quit.
The only thing clear is that all procedures concerning leaving are set and dominated by the EU, that is plainly obvious now. The leaving state has little influence, as it remains within the EU until a WA is reached. Because the EU has evolved into a cross-national political and economic web, then no deal at all would be disastrous, especially for peoples. But it's not a reasonable way to end a partnership and those words "good faith" were rarely applied.
But hey! Who'd have thought it?!!