What has changed is the scale of information though. We used to have small amounts of information and opinions to evaluat, but now there's huge amounts of information to deal with, and those techniques haven't updated to match.
Peer review of scientific publications is an example there - peer review used to involve things like visiting somebody's lab to try and disprove their new type of radiation theories, and now there's so many articles to review that nobody's reading them all, or putting the same level of review in