"if you opened the notification center with a Braille display connected"
This sounds obvious, but imagine all the combinations of all the features that can interact, and then imagine having to test them all manually, because there's no automated model for specific Braille displays.
For decades, integration testing teams outnumber developers. It's just a hard problem, particularly at Apple's scale. It's not unlikely that there are only 10's of users experiencing a bug (though this one likely has thousands), and that it would take doubling or tripling the size of teams to find all these bugs before release.
This sounds obvious, but imagine all the combinations of all the features that can interact, and then imagine having to test them all manually, because there's no automated model for specific Braille displays.
For decades, integration testing teams outnumber developers. It's just a hard problem, particularly at Apple's scale. It's not unlikely that there are only 10's of users experiencing a bug (though this one likely has thousands), and that it would take doubling or tripling the size of teams to find all these bugs before release.