Improvements in the medical regime.
Quote Clinton McKenzie:-
“In my opinion the primary reason for the substantial improvement in safety would come from pilots being more willing to have more frequent and frank discussions with medical professionals, without the fear of damaging AvMed overreactions.”
I think that the only evidence (statistics) about in flight medical incapacitation events causing unsafe flying is without evidence.
It could be held that generally pilot health might be improved, there’s zero evidence of the safety of flight angle.