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Why are pure lead’s structural uses limited?

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A periodic table element box for lead (Pb) shows atomic number 82, atomic weight 207.2, electron configuration, and labels for symbol, name, crystal structure, and physical state, with a legend for color and symbol meanings. — lead Properties of lead.

The structural applications of pure lead are limited primarily by its low tensile and fatigue strengths. Additionally, the metal has a tendency to flow even when subjected to only light loads. Because of these relatively poor mechanical properties, lead is frequently alloyed with other elements—such as antimony, copper, or calcium—to improve its hardness and overall strength for industrial use.123