Why narrow sense heritability is better than broad sense heritability?

Narrow sense heritability (h²) is often considered more useful than broad sense heritability because it specifically measures the proportion of phenotypic variance that is attributable to additive genetic variance, which is directly relevant for predicting the response to selection. This focus on additive effects is crucial for breeding and evolutionary studies, as it better reflects the inheritance of traits across generations. In contrast, broad sense heritability includes all genetic contributions (additive, dominance, and epistatic), making it less informative for understanding how traits can be improved through selective breeding.