It seems to be a difference between the professional pilot and the successful businessman/sportsman - when faced with a changing scenario whilst flying, someone who is used to being right (or being told they are right) in their own profession appears to be less likely to change their course of action when conditions change.
Now that is clearly a generalisation but a professional pilot is more used to replanning on the hoof when the weather changes suddenly - the 'amateur' who may have bags of experience in his own profession may be more reluctant (especially when he has people relying on his plan) when his aviation scenario doesn't turn out to be what he hoped for or expected.
If you are a VFR pilot, it is likely you have very little experience of dealing with rapidly deteriorating weather and even less of IIMC.
Perhaps it is a problem with over-reliance on i-pad style planning which seems so much quicker, modern and more attractive to modern aviators rather than looking at a synoptic or ringing a met office to check conditions. Or even looking at a proper map to gain a better appreciation of the terrain you will be flying over.
Interesting that the report seems to indicate that one of the apps he had running thought the aircraft was much further East than it actually was - or I may have got the wrong end of the stick on that detail.