Comment by wvh

I'd say there's at least a third reason: intellectual (or rather technical) curiosity of photography itself. Often, when I take a picture, it is just to see how a particular shot turns out, much less so for any sentimental value to myself or anybody consuming those images later on.

I'd also say that's most likely a healthy kind of dopamine usage, as it's leading one into a life of exploration, learning and wonder.

But you're right, taking a true in-the-moment picture is a skill.