Over 70% of online purchases now happen on mobile devices, making a mobile-first WooCommerce design an absolute necessity. Responsive themes, thumb-friendly navigation, fast page loads, and one-click checkout are no longer optional — they are the baseline. Stores that aren't optimised for mobile lose customers before they even get a chance to browse. PromotEdge India makes the case for why designing for the smallest screen first is the smartest eCommerce move in 2026.