I do find it incredible that even at this point you still think No Deal is remotely plausible.
Honestly, it does surprise me.
Legal default my hairy Hebrew ring piece.
It's nothing to do with competence. The only way No Deal would ever have been plausible would have been if it was actively pursued by a leader in favour of it.
We know May would be able to get her deal through by holding a meaningful vote on 28 March. So it wouldn't be incompetence that leads to a No Deal, it would have to be by design.