Excellence as a part of ethics

The word "ethical" means "morally good or correct" according to Google. Most of the time it seems that this word is only used in reference to the protection of the rights of others; i.e., discrimination by race in employee hiring is a typical "ethical" issue. While this is certainly a question of good ethics, I am of the opinion that one of the most forgotten ethical issues is that of self improvement. Companies pay us good money to create the software products that bring them life. Users count on us to build software that works how they expect it to. Isn't it morally right for us to do our part in bettering our programming skills and abilities so as to better serve our companies and our customers? If it is, then why don't we consider it unethical to not make the time and effort to improve our programming skills? I believe that we, as individuals, can begin to change this by beginning to improve our programming skills on a regular basis.