Google's own documentation is explicit that user experience and technical quality matter. Page experience signals, including Core Web Vitals, mobile-friendliness, and HTTPS, feed into how Google evaluates pages, and the Search Central SEO Starter Guide stresses that helpful content delivered on a fast, crawlable, secure site is what earns lasting visibility.
This is the dominant reality of modern SEO: development and content are not separate projects competing for budget. They are two halves of one ranking system. A practice that invests in only one, beautiful content on a slow site, or a fast site with thin pages, leaves rankings and patients on the table.
""Google's automated ranking systems are designed to present helpful, reliable information that's primarily created to benefit people, not to gain search engine rankings."
Google Search Central · SEO Starter Guide