It's not so antiquated. I'm a vet at logging stuff and I have tried everything from apps to spreadsheets, but what do I always return to? That pen and paper. I feel that when you actually write things out you activate the brain a bit more and the information seems to stick.

It doesn't matter whether it's a notebook or an app. The point of it is to track it. Whatever method works best for you is fine. But tracking was clearly the point he was making.