Wasif Khan learned Next.js after mastering React because he recognized that Next.js addressed some of React's limitations, particularly with features like built-in routing and SEO optimization. He found the transition smooth, as Next.js builds on React's principles, making it easy for him to adopt. This allowed him to create more efficient, user-friendly applications while leveraging the benefits of server-side rendering and static site generation. Overall, his experience highlighted the synergy between React and Next.js in modern web development.