Because half your audience is strolling around with a phone in hand, casually Googling on the go. Google even uses mobile-first indexing, meaning your mobile site basically defines your rankings. If your site looks like an afterthought on smaller screens, visitors will bounce, and your SEO will tank. Mobile users demand fast load times, easy navigation, and finger-friendly buttons. Ignore that, and you’re driving potential customers straight to your competitors. In a world where people shop, scroll, and search from their pockets, mobile optimisation isn’t optional—it’s the price of entry.