For me the problem with TypeScript or Flow when the latter was a thing was that the syntax/semantics of the sub language of types was extremely ad-hoc with so many idiosyncrasies. Maybe if I programmed it all the time I would learned it. But I had to change the relevant code only occasionally and typing helpers to access DOM required constant look at the spec and StackOverflow.

With Rust the rules at least are simple. While following them can be a struggle the compiler errors at least are much more helpful and points to the problem with the design or the checker limitations.