I'm a full stack dev so I'm also using TS at the same time. While the flexibility is nice, it's too flexible for my taste. To give a one basic example, I want to go to the definition of a symbol with a single action. Not possible with the current TS tooling and all the crazy things you can do with it's type system.

I want the type system to be predictable, so it can support whatever I want to build on top of.

There are features I'm missing with C#, but still I'll choose it over TS any day.