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> Something similar is happening with "mental health", as in "we should be concerned about mental health", where "mental illness" would seem to be a more accurate term.

I don't think it's happening to the term "mental health". Maybe it is being used as a superset of "mental illness" sometimes when talking about eg. homelessness, but most of the time it talks about the general psychological health of people. Eg "People in tech need to manage their mental health".