It's true that they're just sugar but Rust does explain how the for-in loop de-sugars and you've over-simplified considerably. Your syntax also doesn't quite work.

The value is in idiom, turning everything into loop expressions (The "while" keyword is also just sugar, Rust's only fundamental loop is named loop) makes it harder to discern what's actually going on.

If you want to clone the iterator in some cases rather than consuming it, that should look different so that reviewers will see what you're up to.