Oh, I'm totally agreed. It wasn't even a criticism so much as an observation that they could (if they so desired) come up with an in-universe explanation as to why 20th and 21st century pop culture is still so prevalent. If they went with ST logic, it could be the era right before the last world war that finally inspired a lasting peace. Maybe that's why there would be so much interest in the period leading up to that point.
For the record, I'm fine if they never explain it.