Because it's useless information. Some people (like my wife) remember literally everything, at least until their brain fills up. I, on the other hand, have to explicitly commit to memory things I want to recall later. If I don't, it's gone. And why go through the effort of committing something as useless as what I ate for breakfast?

You have to realize that it's you who is the oddball, not the rest of us.

It's not useless information - I get to track what I ate when, I get to figure out the recipe if I like something etc etc. Imagine going "What you had for breakfast is useful information" as if your brain isn't already full of useless information.

> at least until their brain fills up.

(X) That's not how it works.

>If I don't, it's gone.

As I said, for the rest of us, it isn't an issue. We just remember. You don't - so you just go "it's useless information." It's not for us.

As you are discovering in this thread, everyone's brain works differently. You are exhibiting the mind projection fallacy--assuming that everyone else's mind works the way yours does. In fact, neurodiversity is a thing and pretty much every person out there has a unique mental experience.