How do you mean? TempleOS is undoubtably a pretty interesting achievement, both in the artistic and technological sense - but Terry has serious mental issues, and we shouldn't overlook them as "oh, that's just how artists are".
I don't disagree with the premise of very creative people having very different though processes from the majority. There is a very fine line between genius and insanity.
so I don't know that I would say there is a reason for the etymology that relates in any direct way with artists are weird.
Somebody from a wealthy background who has mental health issues might be able to afford to live in an unconventional way, supported by the people around them, whereas somebody from a poor background is going to end up living on the street when those same issues prevent them from holding down a job and paying the bills.