I don't really work in the Javascript ecosystem, so when learning Angular 2 recently, I found all the other tools to carry far more cognitive load than Typescript.
A good example of this is modules. Angular 1 had its own module syntax (partly because modules weren't really a thing when it started). You could write scripts, concat them together and go.
In angular2 we embraced ES6 modules, which means a developer has to deal with loading and bundling etc.
One nice side effect here though is we can leverage more tooling from the rest of the JS community (eg, the great work of webpack) rather than having angular-specific solutions.
What tools are you talking about?