I think the author also underestimates how incredibly difficult these things are to implement. We've seen how hard the async MVP was, and how progressing async support is so very difficult.

There was a good blog post recently on Pin ergonomics, which I hope will lead somewhere good. It's not like they don't know that these things are difficult, and it's not like they're not trying to fix them, but generalised coroutines (for example) in the presence of lifetimes are absolutely monumentally difficult to get right, and they just can't afford to get it wrong. It's not like you can just nick the model from C#'s, because C# has a garbage collector.