I'm not blind, but I've tested some of my apps for VoiceOver and it's just utterly unusable with a "reasonable" speed. You have to pretty much set it to your reading speed for it to be useful, and that happens to be significantly faster than most people are comfortable speaking.
I'm reasonably good at listening to sped-up audio, personally, so this wasn't really an issue for me. I was just providing anecdotal reasoning of why TTS users may set their audio speed to something that might sound unreasonable: it takes forever to navigate the interface otherwise.
Same. It really makes you realize what we take for granted as sighted developers. I can't imagine what the learning curve was like for him, as he lost his sight at age 7, long before many of these accessibility technologies existed. [1]