I think they're kind of saying that's the problem, that intuitively having a screen inches from your face displaying things that are further away in decent detail, with things like contrast and saturation and brightness color palettes being modifiable should have some obvious possibilities for people with limited vision - but Apple wasn't interested in developing for and demonstrating these options.

I'm near-sighted, so I can see how magic glasses that let me focus on everything as if it's six inches away could be nice. That being said, normal prescription glasses work very well for my particular vision impairment, and "You only have to buy glasses once more ever, but they're $3000, weigh over a pound, and need to be recharged" isn't a great value proposition for my needs, but it doesn't take much imagination to figure that being able to toggle even just dark, high contrast, or colorblind modes irl would be nice for some people. Not worth it for me, but possibly for others.