I read it, and I empathize with their stance. I'm actually torn between wanting Typescript to be as compatible with Javascript as possible, and wishing we didn't have to wait for TC39's process to play out before using new features (which I've written about before on hn[1]). Given their design goals though, the Typescript team has done a great job.

[1] https://news.ycombinator.com/item?id=32188944