Stucco surface, made of Portland cement and sand mix, shrinks on gaining strength, introducing tensile stress in it. Therefore, it is reinforced with metal lath, when used on a (wood or steel)stud wall, to resist the tensile stress. Why is a lath not required when stucco is applied on a CMU or reinforced concrete wall?

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The Answer of Stucco surface, made of Portland cement and sand mix, shrinks on gaining strength, introducing tensile stress in it. Therefore, it is reinforced with metal lath, when used on a (wood or steel)stud wall, to resist the tensile stress. Why is a lath not required when stucco is applied on a CMU or reinforced concrete wall?

Stucco Surface, Made of Portland Cement and Sand Mix, Shrinks