You should check out how much raw data just your eyes process for every second they're open (although a significant amount is discarded before it gets to the vision center, but still). Then consider the other senses also constantly doing their thing.
The vast majority of people don't internalize most things. Some internalize even less. It can become a big issue with things like dissociative disorders. (I have some experience with that)
LLMs don't internalize per se (assuming something akin to conscious intent). The foundation of a model is comparable to a human's daily experiences of just being, then the fine-tuning is comparable to formal schooling, and finally the prompting is comparable to meetings for workplace tasks.
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