Doesn't seem like outsized thought and effort given the companies size, resources, and relatively small product focus..
Here's a post from 2006 for example, talking about accessibility in Mac OS 9: https://discussions.apple.com/thread/724948.
Here's about accessibility in Mac OS X Tiger (2005): https://en.wikipedia.org/wiki/Mac_OS_X_Tiger#Accessibility.
It was evidence to elucidate upon a baseless statement you made earlier.
Thanks to strong leadership in the accessibility team, there was an increasing buy-in from the top, and throughout the company. Today, accessibility is indeed in Apple’s DNA, but initially, there was quite a bit of genetic engineering and (dare I say it?) government regulation involved.
It's easy to criticize a company their size, but they definitely do this very very right.