Your own experience is useful data. It is also one of the biggest blind spots you bring to every design decision. When you design for people who are not like you — different age, different income, different ability, different cultural context — your assumptions about what is obvious, easy, or desirable are often wrong. A product designed by a group of Lagos university students who all have smartphones and reliable internet will have assumptions baked in that make it unusable for a market woman in Kano who shares a phone with her daughter. Inclusive design is not charity. It is rigour. The more different the people you design for are from you, the more deliberately you have to seek their perspective — because your own experience will not fill that gap.