Why has "Uradoori No Nukemichi Ane Harem" gained traction in the 2020s?

In the commercial adult anime industry, production studios frequently adapt popular indie works that feature these keywords. These animations prioritize high-contrast character designs, distinctive voice acting, and faithful adherence to the source material's specific fetishes. Why Is This Subgenre Popular?

Using the "Ane" (big sister) archetype to guide the protagonist’s personal growth.