That's why mediums like Roam Research are interesting - they take for granted that they haven't thought of everything, but there's some core idea that they've successfully challenged. For Roam Research, it's the two ideas that 1) everything we think of is linked to other thoughts, that that's how the human brain works, we work with associative patterns, and that 2) the atomic thought is not at the page level, but at the bullet level.