Why is accessibility important?
The most obvious answer is: because it is the right thing to do and we want to live in a world in which no one is disadvantaged. But if that's not enough, there are around one billion people with a disability worldwide. That means one billion potential users, many of whom are currently excluded. In addition, people without disabilities often also benefit from accessible designs and therefore a better user experience.
People who have misplaced their reading glasses or have difficulty using an application on their cell phone in bright sunlight because the contrast is not sufficient or the font is too small benefit from accessible applications just as much as people with permanent disabilities. It must also be taken into account that not every situation offers the best conditions. Even someone with perfect hearing will not understand the announcement on the train if it is full of noisy schoolchildren.