It sounds like you are unfamiliar with what modern JS looks like. > JavaScript - Dynamically typed, does not scale what so ever. Flow has resolved this. It ha

It sounds like you are unfamiliar with what modern JS looks like. > JavaScript - Dynamically typed, does not scale what so ever. Flow has resolved this. It has good investment from Facebook, plenty of adoption, a flexible type system, and you can sprinkle it into existing code as you like. Also try wallaby.js for instant test running. > CSS - Also becomes impossible to manage. See webpack's local css scope. https://github.com/webpack/css-loader https://github.com/webpack/css-loader. > HTML - At the heart of it, the foundation is the layout engine and positioning, and it sucks. Flexbox was supposed to bring sanity, but I feel like we're still waiting on it. Bootstrap or any million css libraries. Just have to wait for Flexbox and we are good.