Finding correct, original sources can be nearly impossible (I've got a bunch if you want a challenge). And having someone else do it also defeats part of what sources are for, that is explaining how the researcher linked the facts together in the first place. Anyway, an unsourced template is useful for later finding profiles that need work (doesn't always mean leaving it for someone else). As long as it's allowed, might as well use it wherever needed (they can easily change display of a template).