this may have been a possibly fatal case of press-on-it is
There is no such thing. Every flight; indeed everything we do in our lives, is done under pressure of some kind.
If somebody wishes to fly from A to B and ends up in a mess due to weather, it not because they wanted to fly from A to B badly. It's because they did not know how to read the weather data and/or how to make enroute decisions regarding changes of plan or escape routes.
If a pilot wasn't particularly bothered about flying somewhere, he would stay at home and GA would disappear!
PPL training is largely to blame in this department. It needs to be modernised, with modern (internet) weather sources, etc.
So, let's stop using this meaningless "Pressonitis" expression and - if anything - start examining what exactly a pilot did to get into a pickle. That way, somebody might learn something. Pressonitis is something straight out of a retired and rather patronising RAF navigator and doesn't teach anybody anything useful.