[vaishnav92]

It's true that personality tests per se might have little value in the business world. But the fact that traits cluster together in non random ways is not irrelevant to making predictions about people. Big five literature is one of the few things in psychology that have mostly stood the test of time.

[NeuroCoder]

There are lots of things in psychology that have stood the rest of time that are much more useful. Developmental milestones, adoption and extinction of trained habits, clinical assessments of sensory modalities at various stages of conduction.