Actually I'm often surprised just how much out there is actually available with no_std feature options? There's obviously a lot of need for improvement in Rust

Actually I'm often surprised just how much out there is actually available with no_std feature options? There's obviously a lot of need for improvement in Rust in regards to small systems, as people have pointed out. But there's also a lot more middle ground in Rust vs, say, C++: You can be no_std and still have Vector, for example, while in C++ the STL is an all-or-nothing thing. It's a smaller community, and it will come down to individuals deciding it's important and making contributions.