Going back to the original question, is there a pattern?
YES
Do you lack observational skill? It is screaming at you from not only my post but many others, read them again.
It is the Lack of standards.
Tightening the timeframe makes it easier and cheaper to learn and, less beneficial for the instructor and the school who is paid by the hour.
Tighten the standard and the people will stop crashing.
Standards setting comes from political will, nowhere else. Political will is generated from within your CAA or it should be directed by the politicians to generate it if it is found lacking in the top end of the CAA.
If industry says that the standards are slack then they must approach and lobby those responsible to fix them.
R22's and 44's aren't twitchy beasts, in fact they are so ridiculously easy to fly and operate that it is not funny.
I must add a well known fable; "It's a very poor tradesman that blames his tools." Keep them sharp and keep yourself sharp.