Scientific UI Design vs Arts

Software UI designs should start with being scientific. Scientific here means well organized. One of the way for UI to be organized is to: Make sure each UI element is aligned or related to at least 1 other UI element

When the rule above is ensured, the whole UI design is as one.

Scientific UI design is first but not the last. A well scientific UI design is considered, let's say 80% of quality, then the rest of 20% is UX part of UI, attractive, beautifulness, arts. But this should be done later, since practically it takes 20% of time to make a well designed UI, but it takes the rest of 80% of time to make the rest of the beauty and luxurious UI.