That and more importantly that you unconsciously aware that it's saved somewhere that you can recall / review later. So your brain doesn't store the information

That and more importantly that you unconsciously aware that it's saved somewhere that you can recall / review later. So your brain doesn't store the information to long term storage. In terms of computing, it was only stored on ram, and not going to hdd / ssd, and later will be flushed to be replaced with other info. Which is not a bad thing if that information isn't crucial for long term.