Wow, that`s very true... > My disability is not a tragedy of biology. It is a failure of infrastructure.

Everybody is different. Tall, short, strong, week, two legs, one leg, short sighted or blind. So it makes a lot of sense to point (as a mistake) that our infrastructure favors one type over the others.

> the "Checkout" button is labeled "Button_Graphic_v2_Final"

This is a very good point.

Everybody is also different at different times in their life. Many people will develop at least one disability as they age, but even in temporary scenarios good design is accessible design. Consider opening a door when holding a heavy package by yourself. Good doorknobs, as mentioned in the article, make a world of difference