"the Scheme Steering Committee calls it "the world's most unportable programming language"" -- and they're the advocates!
miniblog.
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Contrasting the C++ committee with Rust's RFC process, and avoiding antagonistic design evaluation:
Google is setting up an independent committee for the AMP standard: https://www.theverge.com/2018/9/18/17871666/google-amp-open-source-committee-governance-instant-article
C++17 features being discussed: https://m.reddit.com/r/cpp/comments/4pmlpz (I'm impressed to see many committee members, even Stroustrup, on the cpp reddit!)