I think it's fine that some things just disappear with the sands of time. Not everything needs to be preserved.
> it's fine that some things just disappear
The thing about History in general is that we as present time people have a poor intuition of what is valuable historic data for people in a future (long time from now) time.
Today we draw conclusions from graffiti on Roman walls or Babylonian complaint records. Arguably at the time nobody would consider vandalism or customer service records worth preserving for posterity.