I'm sympathetic to the GP's point. Every time I read about yet another custom GUI toolkit, I want to scream, because I know it might lead to more applications b

I'm sympathetic to the GP's point. Every time I read about yet another custom GUI toolkit, I want to scream, because I know it might lead to more applications blind people can't use. If screen readers could really see the screen for themselves, instead of having to be spoon-fed accessibility information, then custom toolkits with no accessibility support wouldn't be an issue anymore. But, as you said, OCR isn't perfect. I'm not surprised that it still has inaccuracies when recognizing code in particular. Also, computer vision takes a lot of computing power. I'm going to be sad if someday it ends up taking a powerful GPU, possibly running on a remote server, to enable a screen reader to do the things that a 90s computer could do without breaking a sweat via programmatic accessibility APIs.