Somewhat ironic but not sure if you know, Typescript is made by Microsoft and the lead Typescript language architect is Anders Hejlsberg who also was heavily involved in the creation and architecture of C#.
Exactly, the idea is great and you can clearly notice the intention of making JS more C#-like, but the foundation is not suitable. Could you imagine trying to "C++size" the whole Python ecosystem? Shudders!
BTW dude I like your content, after Rails, Phoenix is my preferred stack, so nice, and the community is cool, too bad the job opportunities are not there yet in sufficient quantities.