When we design for disabilities, we make things better for everyone. This is called the Curb-Cut Effect. The term was coined by disability students and activists in the 70s, who added curb cuts to the Berkeley sidewalks to make access easier for those in wheelchairs. They discovered those also helped people with strollers, using trolleys for deliveries, etc.
A more modern example would be captions in videos: they are a feature designed for deaf and hard of hearing people, but also benefits people with ADHD and auditory processing disorder, people who want to listen to a video without sound for various reasons, etc.
@stephaniewalter This is an excellent explanation! The same applies to many things. For example, making the Web more accessible not only helps people with some disabilities but all the people.
@stephaniewalter Of you would like more examples then Microsoft has an introduction to inclusive design which has a bunch along those lines which I like.