We use Next.js because it's the best framework for server side rendering on react right now. Our platform handle websites for clients, which means on all of those websites we need to worry about the SEO, and that google can find them on the search results. Next made it extremely easy in combination with express to be able to render dynamic routes based on the user configuration for their website. We were able to build a small "Wix" in our own platform. 😊