I am impressed and pleased that what a few years ago would have been a highly specialized disability support tool seems to now be a case of changing a few settings in a mass-produced product.
There was a story that came out when Jobs died about how he'd personally intervened when a bluetooth update(?) broke the software a kid in a wheelchair was using.
In the early 2000s, Apple realized that some of their most prominent school deals were in danger of falling apart due to OS X's insufficient section 508 compliance. Since OS X marketshare was too small to ensure a sufficient ecosystem of third party accessibility solution providers (as existed for Windows), Apple formed an in-house accessibility team.
Over time, Apple realized that doing accessibility in-house and treating it as a full stack responsibility fit in well with the company philosophy, so today accessibility is indeed treated as a very important aspect of products.
Coincidentally, this week marks the 10th anniversary of the official release of VoiceOver, Apple's OS X screen reader.