Kat Holmes wrote Mismatch, which talks about how many objects are designed with only one type of user in mind – right-handed computer mouse, pilot seats meant for people who are a certain height, etc – and how these objects lead to exclusion. She then talks about ways to design inclusively for all.
What I really liked about her perspective on disability, which is seen by a lot of people as a personal health condition is that she redefines it as a mismatched human interaction, and that those mismatches are “the building blocks of exclusion.” This definition reframes what normal is supposed to be. In fact, Kat says that there’s no such thing as normal.
No one is the “average.” We’re all a little different, and we all have different needs. Given that over 1 billion people in the world are “disabled.” Given that, it’s easy to see why designing for accessibility is important. It’s not just your grandfather that can’t read your font; it could be someone who is recovering from an eye surgery to someone who has 20/20 vision but is standing in broad daylight squinting at their phone.