In case you’re still interested in this type of resource, here’s another one I just learned about: https://google.github.io/comprehensive-rust/
It’s by the Android team at Google, and while it doesn’t require knowledge of C++, it seems to be intended to bring devs up to speed on the concepts required for using Rust in Android and Chromium.
You’re not wrong, but not everything needs to scale to 200+ servers (…arguably almost nothing does), and I’ve actually seen middle managers assume that a product needs that kind of scale when in fact the product was fundamentally not targeting a large enough market for that.
Similarly, not everything needs certifications, but of course if you do need them there’s absolutely no getting around it.