Theresa May needs permission to do anything in her historically weak position, and is immersed in multiple parallel and interwoven negotiations on Brexit - with her own Cabinet, with the Parliamentary Tory Party and factions within it, the full Tory Party in the country, the DUP, Parliament, British employers and Brexit voters (those of us who didn’t vote for Brexit about the only ones excluded from this labyrinthine process). There is no vision or strategy, just a series of internal trade offs which are constantly revisited. This is before she even gets to sit down with the EU, as represented by Tusk. The EU itself has a torturous job in keeping 27 countries with a common stance, which leads to Barnier not really being able to negotiate much at all - he has a script which it would take an age to change, but it would have been easier if the U.K. had a clear position.
It’s a recipe for no progress and collapse in confusion rather than collapse on some kind of principle. After which we in the U.K. could end up with an ideologically driven hard left Labour Government and in even deeper ****.