Are you saying it would NOT have been useful to historians/genealogists if people 500 years ago had produced perfectly preserved documentation of all of their w

Are you saying it would NOT have been useful to historians/genealogists if people 500 years ago had produced perfectly preserved documentation of all of their writings in their language at that time? You're also using 500 years of antiquated human communication technology to extrapolate what the next 500 years will be like. Shakespeare wasn't taking selfies, writing blog posts, and responding to commenters in real time back then. English/natural language evolved differently in a world that wasn't connected to the internet. There's no reason for me to believe the last 500 years of communication will be anything like the next 500.