Airbus may be taking their time... but rather a lot of fuss about not a lot
This AC issue is probably complex to solve - it is easy to say "automatically switch AC busses", but to design a "safer" system than current, and ensure there are no hidden flaws, no doubt takes time.
Please understand that to solve this "major failure" that requires, god forbid, pilots to fly the aeroplane
is to press one button
There have been sim training exercises highlighting this...
NoD