It's true. Unless you carry a camera around constantly you're going to miss almost all those unpredictable moments. I completely agree about not needing to document everything - plus documenting things misses the spontaneity of it all - and unless you're some kind of world class photographer/videographer you're going to lose most of the emotion and humanity of those moments.

So why do I still obsessively document events? Simply an aide-mémoire - because my mémoire is awful.