FL. Excellent posts, thank you.
However:
When steps are taken to reduce risks/enhance safety in light of accidents (generally, not just in aviation) it does not necessarily follow that there was anything lacking previously.
Whilst this may be correct, I would also suggest that in many cases it does follow that something was lacking previously. As for this one, I think one could fill a book on with what was going wrong prior to the accident.
S-D