Let’s stop treating "leaving academia" as negative. Scientists train for academia, industry, or what suits them. Industry isn’t an alternative; it’s a choice. In fields like engineering, most PhDs go to industry, and no one calls it "leaving academia." We should train scientists for diverse paths.
More than 40% of postdoctoral researchers leave academia, according to a study of some 45,500 researchers’ careers https://go.nature.com/3Ej9RxA