For me, Rust has a size issue, its std lib after strip is at least 3x as to libstdc++, and Rust is default to statically link to that lib! When you have a few Rust binaries, the storage space adds up quickly, not a good fit for embedded boards where storage is limited(same problems for Go, by the way).

Why can't Rust have a mode to do what c/c++/etc doing, that is, a reasonably sized standard library to link to? Yes I'm aware of 'how to minimize rust size' and 'prefer-dynamic', still comparing to c/c++, it is so much worse when storage size is a concern.