I think anyone who believes that professional job stresses compare to the overwhelming life stresses that accompany poverty doesn't really have a grasp of the real world.
I've never seen yield strength on a lead spec or cert, just tensile strength, elongation and sometimes density. It must be very low considering how easily lead deforms.
ASTM A 892 rates lamellar content for high carbon bearing steels. The ratings are from LC1 (completely spheroidized) to LC6 (appears primarily lamellar).