I'm a fullstack developer and I started picking up more modern frontend frameworks 3 months ago. Has this person try to manage a large complex site with just HT

I'm a fullstack developer and I started picking up more modern frontend frameworks 3 months ago. Has this person try to manage a large complex site with just HTML, CSS, and JavaScript/Jquery? It's a mess, a complicated mess. Sure, for small sites and small codebases, use basic tools. However, how many companies are building basic sites now? React, Typescript, SCSS, and all these other technologies came around not to make your life more difficult. It popped up because for specific use cases it makes your life a whole lot better. Also, backend is not any easier...