In art these parts are often overlooked, but they are significant none the less. E.g. getting the proportions right is an objective metric and really off putting if it is wrong.
And in programming the "art" parts are often overlooked and precisely the reason why I feel that most software of today is horrible. It is just made to barely "work" and get the technical parts right up to spec and that's it. Beyond that nobody cares about resource efficiency, performance, security, maintainability or yet alone elegance.