The article is a reminder to all well-intentioned people: When working on something, design it as if you are going to use it yourself. Abstracting your customer is not acceptable. Especially if they are people with disabilities, or if they live in less developed countries than yours. If you are making a pump for them, make a good pump. If you are making a football, make a good football. If people need simple but functional, sturdy and efficient devices, make exactly what they need, not a funny looking multipurpose artifact you would never use yourself.