Do hero banners push important content below the fold on small phones?

As a mobile-first e-commerce designer, I'm concerned about how large hero banners impact user experience and content visibility on smaller smartphone screens. I've noticed that many of our hero images take up significant vertical space, potentially pushing critical product information, calls-to-action, and key content below the initial viewable area. This raises serious questions about user engagement, conversion rates, and overall mobile browsing effectiveness. I need concrete strategies to balance visual impact with functional design across different device sizes.