First of all, someone said that if you watch "very old videos" you can see 800 races with blocks, but they stopped using them around 1900. Did anyone else catch that?
But besides that. At the level that you are talking about, these 800m races are just that, RACES. They are a challenge to see who can maximize their physical abilities and limitations through use of superior tactical skills to control the situation that unfolds, unpredictably around them in under two minutes. It's different every time. That's the difference between distance racing and sprinting. Up through the 400m, it's basically you versus the event. Above that it's very much a competition in every sense.
That's why you all come to letsrun.com everyday and not to letssprint.com or letsmeasurevo2MAXinalab.com.