I see the changes in Rust as a positive, not a negative thing. I do understand that it may become a burden for a Rust programmer and is a major hindrance if you'd actually want to go to production with it. But even this fairly major change should not break a lot of existing Rust code.

But this allows Rust to do bleeding edge research instead of finalizing on a strict specification before knowing if the design will work in practice. It is also very refreshing to see programmers admit that their choice was wrong and not insisting on staying with a bad choice that was made earlier.

Consider Rust to be a practical research project, at least for now.