What I mean is that adding C++ files to your iOS project and having them compile and work together without any new compilation steps or settings, and to have Sw

What I mean is that adding C++ files to your iOS project and having them compile and work together without any new compilation steps or settings, and to have Swift code call a C api on your C++ implementation -- all of this is straightforward to do for iOS, and Xcode even creates the "bridging" headers for you and has built-in support for C++. Now, adding Rust into the mix? That will be much more involved and certainly not as simple; nor is it natively supported by the iOS toolset in Xcode. That's what I meant when pushing back on your notion that "Rust is just as capable at integrating with the specific platforms you're talking about."