They are not all like that. I work with research psychologists who are as logic oriented as any chemist or biologist.
I should disclose that I have a relative of the type who got into psychology to solve her own problems.
Full disclosure here!
I work with a guy who has a PhD in Psychology and is a psychometrician in practice. He is a far better programmer then I will ever be & has an impressive knowledge of statistics.
Aphorisms I don’t think are supposed to be absolute, just general “rules of thumb” allowing for the exceptional case.