I majored in psychology in undergrad. A big part of why I didn't look for a psychology focused job is that the science is all so loose. I'd often learn about two different study-backed phenomena is two different classes that somewhat contradicted each other. Or I'd learn in a subsequent class that a previously taught study has been invalidated in one way or another. Almost everything is measured subjectively, so huge parts of our knowledge of psychology are a house of cards resting on assumptions that the diagnostic questionnaires used to measure are accurate and reliable. Many of the measured effects are small, and so it's hard to trust that randomization and controls are sufficient. Replication of results is a major issue.

It all just feels so 'loose' compared to the physical sciences.