When building complex React applications, developers often encounter challenges with Next.js, including complex routing, server components learning curve, build performance issues, memory usage concerns, hydration problems, and deployment and hosting difficulties. To address these pain points, developers are exploring alternative frameworks such as Remix, Astro, SvelteKit, Nuxt.js, and Gatsby, each offering unique strengths and advantages in data handling, performance, developer experience, and project types. By understanding the key differences between these alternatives, developers can make informed decisions about which framework best suits their specific needs, ensuring a more efficient development process and better end product.