Coming from C++, I think it is the whole picture - Key figures in the community that established a culture of caring about cross-platform - Cargo making it ve

Coming from C++, I think it is the whole picture - Key figures in the community that established a culture of caring about cross-platform - Cargo making it very easy to have portable builds - Standardized platform conditionals both for dependency declarations, for "including" files, and for individual items (e.g. functions).