The reason screen readers actually used video intercept was back in the early 90's when windows and Office were taking off, there were no standardized Access API's. By the time those got developped the developers didn't really change well, most of them at least. Taking JAWS and NVDA as an example, list views have a determined size for each column, which may sometimes result in things being shortened on-screen. Regardless of that NVDA always reads the whole thing, while jaws will just read the abbreviated version and end with "dot dot dot", making a blind person have to hopefully find an option to make it larger and if not... just dealing with it as is. Something similar happens in notepad. NVDA always has access to the whole edit field, so the window doesn't have to be maximized or anything. With JAWS, frequently a not maximized window will either result in just the desktop icons or some other window being read with mixed portions of actual text, and even if it's maximized, a baloon may again cause that kind of thing to happen. However I think supernova is the one that really just uses the video intercept the most. I had problems in really large desktops of 200+ icons where if I Just got out of what it could see it'd just say no focus detected, same in a start menu, if scrolling is unchecked eventually you'll just exit its visibility and hear, start no selection as long as you're in that area.
I didn't have so many issues with NVDA or window-eyes.
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