Agreed, most people looking to understand the psyche would be better off reading literature / art.
> Psychology is probabilistic science
It’s not science if it doesn’t include reproducibility.
Yeah but the key difference is that QM is a mathematically solid theory starting from a couple basic laws to yield predictions with p-values of 0 (for all intents and purposes anyway). Also note that there are non-probabilistic measurements in QM, be they measurements of aggregate behavior or just pure states [1]. In that respect, QM and most physical sciences really are miles ahead of psychology (though I don't think that's reason to discredit the latter, as it has obvious empirical merit).
If I may be a bit bolder still, I'd argue that it's not merely a quantitative difference. As pointed out by many other comments, psychology completely lacks any sort of unifying framework, except perhaps for small clusters of thematically similar phenomena. A collection of empirical facts does not a scientific theory make, or--taken to the cheeky extreme--"All science is either physics or stamp collecting" [2].