To clarify a bit... I'm not saying people are watching their screens the entire time or anything. Although some might depending on their view of the field. But

To clarify a bit... I'm not saying people are watching their screens the entire time or anything. Although some might depending on their view of the field. But it's especially cool for looking at critical plays and potential (or actual) "video review" situations, where everybody wants to see "did he really get his foot down in-bounds?" or whatever. And of course the stadiums usually replay a lot of that kind of stuff on the big jumbo-tron deals that are fixed in place in the stadium. Still, there are plenty of times you might want a closer look at something and want to check the television broadcast (or some stadium specific internal feed, or whatever). Whether it's a "waste of time" or not probably depends on your perspective. Some people think watching sports in general is a waste of time. Others think playing D&D is a waste of time. Somebody, somewhere, probably thinks posting on HN is a waste of time...