In my experience, that has never been an issue with any Rust-based projects. It’s quite the opposite. 80% of time is spent completing the first 20% of the project, and then the remaining 80% is quickly finished as everything fits into place. Most of our time is spent in foundational work getting widgets created that we can use with our theme system, and then the actual implementation of the interface in the application is stupid easy.
What you describe is what I felt developing the GNOME extensions. There’s very little you can do to resolve issues that you encounter there.