> The only difference between a brain and an LLM maybe the size of its memory, and what kind and quality of data it's trained on.

This is trivially proven false, because LLMs have far larger memory than your average human brain and are trained on far more data. Yet they do not come even close to approximating human cognition.

>are trained on far more data

I feel like we're underestimating how much data we as humans are exposed to. There's a reason AI struggles to generate an image of a full glass of wine. It has no concept of what wine is. It probably knows way more theory about it than any human, but it's missing the physical.

In order to train AIs the way we train ourselves, we'll need to give it more senses, and I'm no data scientist but that's presumably an inordinate amount of data. Training AI to feel, smell, see in 3D, etc is probably going to cost exponentially more than what the AI companies make now or ever will. But that is the only way to make AI understand rather than know.

We often like to state how much more capacity for knowledge AI has than the average human, but in reality we are just underestimating ourselves as humans.