> I get a strong sense of Rust demanding that users subjugate themselves to all the choices and opinions of the architects [..]

I don't really get where you're coming from here, especially with regards to this issue -- it seems like almost everyone, including Rust core team members, agree that `impl Iterator for Range` was an API design mistake, that came out of (IIRC) Iterator existing prior to IntoIterator in the pre-1.0 days. This seems to me to just be an unfixable design flaw due to backwards-compatibility rules, not something that really speaks to the design of the language as a whole.