Inclusive design describes methodologies to create products that understand and enable people of all backgrounds and abilities. It may address accessibility, age, economic situation, geographic location, language, race, and more.
Documenting UX processes and design decisions are organizational memory, so even Agile projects that emphasize minimal documentation benefit from two cases of lightweight UX documentation.
Humans have a deep need for autonomy, relatedness, and competency in their life. Catering to these needs in UX design can drastically increase user satisfaction.