And this can be scientifically measured by mouse distance and clicks.
> most optimal workflow to accomplish a user's tasks
And this can be scientifically assessed by taking all use cases and refactoring over them.
List all the available goals at any given "location" in the program. List all the steps users take to get accomplish their goals. Consolidate and refactor, then optimize on the shortness, obviousness, and fault tolerance of every flow.
This is more fundamental to the user experience than colors or animations or the availability of any single feature.