Exploration and immersion are the two most impressive aspects of Oculus Rift -- arguably its definingfeatures -- and Team Fortress 2's VR Mode highlights neither.
Feature Driven Development, another popular approach, contrasts with Scrum by defining the main features that a software product must have, prioritising them and then working doggedly through the list.
This number is exceedingly small, and shows that the superficial features, which we often think of as defining human ethnic groups, are literally only skin deep.
Its defining characteristic is the low-observable, or stealth, features that make it nearly impossible to track or target using conventional radar or heat-seeking missiles.