Well as said, you cant train or brief for every eventuality.
The main thing of course is to fly the aircraft and not fly it into the ground. Basics.
Without being critical of the dead crew, if you fly a power setting and a known attitude, the airspeed will look after itself. Fairly basic stuff, that should have been taught at flight school and perhaps should have been an instinctive reaction. Some of my training (VFR) years ago, was to have the instrument panel covered or partially covered, representing all or some instruments U/S. Basic training.
I fear we are and have been getting away from the basics for quite some time now. Yes it will get worse. There is too much emphasis on the computers and avionics and getting it all complicated. So much so, there is a line of aircraft, built by the new master race of Europe for e.g.,, that has had such an avionics "upgrade", it requires a whole new type rating. Where is the K.I.S. in that??
Where's our friend when you need him? I'm sure he would have a view on all this too.