4 - I don't know about boeings, but any failure mode in an airbus that knocks out both autopilots, also puts you in alternate or direct law, which is a very different flying "feel" to normal law, and certainly something you couldn't and wouldn't want to practice on the line if you valued your job
I've had a bottle of good French village red, but in a euphoric vinous fog, I recollect the not uncommon 2 x FMGC failure placing you in normal law and without autopilot reliance.