The brilliant Rustwasm team has done a great job building a solid foundation for rust wasm support. However, since the organization has been closed, only parts of the crucial repos have been moved to new maintainers, remaining others like The book of Rust and WebAssembly and create-wasm-app unmaintained. The steps listed in the book to create Hello World are not working now. This is really discouraging to someone who's new to rust wasm. It seems the community is still pretty active in contributing to these repos, given the massive number of unmerged PRs. We just need new maintainers, new hearts for rust wasm. 
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Never even tried create-wasm-app. I use Yew, a robust framework that is maintained and rapidly evolving. I wrote some data-heavy applications in it to render huge tables while providing instant search. This definitely has a use case. I still believe.
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Happy to report the Rust and WASM are alive and well and look like having a great future.
In the last few weeks I have created two Rust apps that run natively on Linux, Mac and Windows and in the browser when compiled to WASM.
Both are displaying real-time data visualisation. One uses slint to create the GUI the other is using wgpu for speed and 3d effects.
All the parts required to do this: wgpu, wasm-bindgen, web-sys, js-sys, wgpu, worked flawlessly and have been worked on very recently.
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Glad to hear that the ecosystem of rust wasm is all good. 
However, I still believe repos like The book of Rust and WebAssembly and create-wasm-app should remain alive. These repos are first step for beginners to learn rust for wasm and should be actively managed to ensure they are easy to follow and use.
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