I suspect our brains have always been better at remembering meta-information than information itself. E.g. where you last saw an item of clothing vs the configuration of colours on it. In most cases this makes sense, and is essentially a space-saving trick, but there must be some point at which the meta-info becomes too inaccessible or too slow to utilise that remembering the full detail directly becomes worthwhile. Convincing your brain of that before it becomes too late can be a regular challenge with so much readily available externally stored information.