In 2012 you were building sites and even applications with a stagnant language (JavaScript) that lacked any module/bundling support while having to support mult

In 2012 you were building sites and even applications with a stagnant language (JavaScript) that lacked any module/bundling support while having to support multiple browsers with differing standards. Routing, state management, dependency resolution, etc. were handled on an ad hoc basis if at all. The current complexity is a result of addressing these issues and doing so at a rapid pace.