These are problems Rust users face that have nothing to do with capabilities of the compiler, but rather requiring work on libraries, tooling, and advocacy:
- iOS: Rust is not tier 1 on this major platform (installations number in the 100s of millions), which would help make it an important alternative to Swift and Objective-C
- Android: Rust is not tier 1 on this major platform (installations number in the billions), which would help make it an important alternative to Kotlin and Java (discussion)