Good defaults are extremely important.
However, I find this a bit irksome:
> The majority of people with vision impairments aren't people who are used to thinking of themselves as disabled and know their way around an a11y menu
That should change, and to the extent that something like this makes a small push in that direction, so much the better. Disability is a spectrum, everyone will deal with disability to some extent in their lifetime, and accessibility features are for everyone.
Separating out "serious" accessibility considerations from those of people with "normal" accessibility needs is just likely to make accessibility features even more second-class. If the main problem is the problem you describe, it should be fixed by better surfacing the existing accessibility features.
I am really liking this upgrade. There is something appealing about seeing _less_ of the OS and more of your content. I know this felt like lip service, but the focus here really is content.
For example the lock screen. Before you even unlock your phone, your wallpaper is more visible than before. I've never enjoyed having my wallpaper cycle more than I do with update.
This is an update people are going to absolutely freaking fall in love with. It's good stuff.
I'm reminded of a meme, from around when Facebook had its IPO:
"Why is Facebook going public?
They couldn't figure out their privacy settings either!"