> Lutusp seems to be complaining about people who feel descriptions are sufficient and make no effort to discern the underlying mechanism. Is there really disagreement on this point?
Yes, among psychologists, who insist that explanations aren't necessary, that it's science even if no one tries to identify a cause for the effect being measured. But this assumption is now under serious challenge, as more and more emphasis is being placed on a search for causes, to the degree that the director of the NIMH recently ruled that the DSM (psychology's "bible") will no longer be accepted as a source for science (it will remain as a diagnostic guide).
The practical meaning of this change is that researchers who apply for funding through the NIMH will need to avoid using the DSM's symptomatic categories as a basis for research -- they instead need to express their proposals in more scientific terms, in terms of causes, not just effects. In other words, explanations, not just descriptions.