That pain is what knowing something means.
Philosophically we're talking about embodied qualia, which is how humans experience objects and more basic sensations.
Language happens later - much later.
The defining property of a bag isn't that you can put things in it. Like language that comes later. The defining properties are how it feels when you hold it, when you open it, the differences in sensation between empty/partially empty/full. And so on.
An LLM has no embodied experience, so it has no idea what a bag feels like as a set of physical sensations and directly perceived relationships.
Failure to understand embodiment has done more to hold back AI than any other philosophical error. Researchers have assumed - wrongly - that you can define an object by its visual properties and its linguistic associations.
That's simply not how it works for humans. We get there after a while, but we start from something far more visceral - so much so that many fundamental linguistic abstractions are metaphors based on the simplest and most common qualia.
