The link kind of explains why this was a difficult problem, but I think it's worth a moment to consider why this particular difficult problem just wasn't solved. Why was Apple OK with just shrugging, eh, it's hard ?

This is a Quality of Implementation issue. Quality is truly important but because Quality is hard to turn into a metric you'll see management don't like to make it a goal, after all they can't really measure if they succeeded and so when it is competing with other things which are goals it's just abandoned.