These are attributes that are no longer necessary or on the verge of becoming extinct. They are sunset features. They are features that are on the verge of becoming obsolete and fading into darkness and oblivion. Sometimes EXTs cannot be removed because there may be a small subset of people that demand the feature. In this case, a decision has to be made to abandon the features or keep the feature. Sometimes the decision to abandon is the best way to go because of cost issues and because the company is going down a new technology path. This was the case with recent versions of Microsoft’s operating systems that abandoned some of the legacy DOS code. Apple made a similar decision in regards to abandoning DVD drives in the MacBook Air product and the decision not to include a camera in the iTouch. All of Apple’s decisions are influenced by product positioning, product costs, and the emergence and decline of technologies.
The next category is actually a subcategory of extinct features. When products or services lead to actual dislike of a product or service, then they should be retired or at a minimum require major redesign.