Imo this is really the only way to get accessibility right in practice. It makes sense that Apple has a reputation for good accessibility integration.
The effect may be less for accessibility features, but it would still be there. I’d highly suggest anyone building out accessibility features to at least consult with disability advocates and other end users.
And that is usually the case in reality. Most small, custom built websites are unusable for the impaired. Doing a11y well requires effort.
I remember one time my mom told me about a meeting she attended hosted by an organization in our state called ‘The Council for the Blind’. I think it was about how and where to get your COVID-19 vaccines.
The presenter was a sighted man on the council. Apparently, although he could see his own notes, he had some trouble getting his PowerPoint presentation to display on the Zoom call. He spent 10 or 15 minutes fiddling with it before an attendee finally butted in and said ‘You know, most of us won't be able to see your slides at all even if you get them working. Why don't you just go ahead and post a link to them after the presentation?’. There are lapses of judgment that are possible even when you have every reason to, abstractly and externally, ‘consider’ the position of someone with a disability you don't have, but that just never occur when you have that disability.
I know it's a silly story, but that kind of stuff happens ALL THE TIME. It's also really common for websites or software to have accessibility features that are so ill-considered, they're practically unusable.
You're right that positions for, e.g., blind software engineers, could be hard to fill for small companies. But you don't have to involve disabled users only at that level to make sure that they're part of your development process. You could have disabled users as testers with much less difficulty, by reaching out to relevant organizations for (perhaps paid) volunteers.
This is a useless accessibility feature, if you ask me. It's over engineering.
I guess it comes down to your personal interpretation of “usefulness”, but frankly I think you take for granted the amount of detail that you’re able to ascertain from being (presumably) fully sighted.
There’s no reason that someone with any visual disability can’t appreciate a scene with as much detail and intricacy as you can, if it’s adequately conveyed to them.
Words and grammar can be learned and expounded upon, but the description of a scene as “a tree on top of a hill” cannot, so why not err on the side of being overly descriptive for those that can understand, and leave the door open for those that can learn more?
Personal favorite “Easter egg” in their accessibility utilities is the baroque voiceover descriptions for the built-in wallpapers. A current colleague of mine shared it last week as part of Global Accessibility Awareness Day - https://twitter.com/mattt/status/1395439320652148736?s=21