This is weird, I have now played with one friend and we are doing old content, its nice to do archeology at same time, but we never had same dig sites? its bit boring because another one need to just idle while friend is digging.
Interesting proposition. Tbh I never considered this as part of possible group content but there might be something to it, making it a bit less mundane. Saying that, it might easily end up that Blizzard implements something one day just for almost no one to do digging in a group.