Also further to above.When I did an A320 rating back in the early days of it's introduction the 'mechanical backup' landing was part of the training mainly I think, because 'manual reversion' was always part of any Boeing rating ( eg.737/727 ) at the time so this was meant to be the Airbus equivalent of that.
If you were set up on a stable approach on a very long straight in approach with no significant cross wind it was possible to get it on the runway. Introduce any turbulence or a cross wind more than about 5 Knots and it became virtually mission impossible!