I agree that Google has not been focusing on accessibility at first, but what is missing from the last version of Android compared to iOS ?

At this stage it's a long list of small details rather than any specific feature. Apple place an extremely high value on UI consistency, which is disproportionately important for visually impaired users. Accessibility is an intrinsic part of their design culture, rather than something they retrofit on later. Subtle things like menu items being in a logical order make a really big difference when you rely on a screenreader. Apple also work far harder to promote and support accessibility for third-party developers. Accessibility is always a major focus at WWDC and is deeply woven into the Human Interface Guidelines. UIKit is highly accessible by default.

By way of metaphor: Visually impaired people need to be extremely neat and tidy, because they can't easily navigate a messy environment. If you don't put things back on the shelves in exactly the same place every time, you're in deep trouble. Google have a really poor track record of putting things in the same place every time.

For users with other accessibility needs, the size and consistency of the iOS ecosystem is often crucial. iOS gets all the good apps and peripherals first, because it's a much easier development target.

> because it's a much easier development target.

Lol

No it is not

A device that doesn't have to be replaced every 18 months since that's the only period of official upgrade support?

(Said as a former nexus 5 owner)