If people thought of pointy-clicky UIs in similar terms to the way they build CLIs there would be more refactoring and less rewriting. "Breaking the UX" in a CLI tool means that untold numbers of its dependents are broken. It's a breaking change to your public API, and it shouldn't be done. The only reason you'd do it is if your first attempt was a complete failure. We should treat user interaction with the same level of respect we treat all the other APIs.
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If people thought of pointy-clicky UIs in similar terms to the way they build CLIs there would be more refactoring and less rewriting. "Breaking the UX" in a CLI tool means that untold numbers of its dependents are broken. It's a breaking change to your public API, and it shouldn't be done. The only reason you'd do it is if your first attempt was a complete failure. We should treat user interaction with the same level of respect we treat all the other APIs.