You don't need to carry them in your head. Having a collection of recommendations for everyday tasks is highly valuable as the signal to noise ratio here will be through the roof compared to google. You might consider it a waste of time, but many of us do this kind of research when we decide to optimize some corner of our lives. Sharing it doesn't take that much additional time and saves everyone else quite a bit of time. If lots of people do it we collectively save huge amounts of time.