I suspect these two things are related. ES2015 more than doubled the size of the spec and each spec since then has continued adding loads of things that take pr

I suspect these two things are related. ES2015 more than doubled the size of the spec and each spec since then has continued adding loads of things that take precious kb to implement. That said, it seems like there are serious code savings to be had with some things like destructuring, template strings, and arrow functions. Generators are probably complex to add, but also don't transpile well (that is, debugging the resulting code is a horrible experience).