Yeah, but in the day that was done to iron out some bugs, like screeches or cracks in the recording, or if someone messed up big time. Other than that, it wasn't needed, "just" mixing and mastering.

Hell, listen to Bremen 1995, that was recorded live from radio, and the mix is almost perfect. Give the same people (or someone else) some time at a mixing desk, and you end up with the sound like on the Wembley DVD...