I came from the much cleaner, simpler type system of AS3, but I don't really see a problem with the complexity of TS. There are a lot of aspects of its type system I will probably never use... but I don't have to. I've written a lot of fairly complex business and game software for the web, and never found myself reaching for a conditional type. Meanwhile, keyof and union types are handy for autocomplete hints. And to me that's all TS is really about. It's just there to make large scale javascript less of a dynamic, chaotic, untyped mess.
