#ChatGPT (4) insists on the importance of "external reality":

"Absolutely, it's often more straightforward to consider our own immediate perceptions and experiences than to account for the vast complexity of the external world. This is partly because our perceptions and experiences are directly accessible to us, while the external world is not. We can only access the external world indirectly, through our senses, and our understanding of it is mediated by a complex set of cognitive processes.

. . .

However, it's important to note that our personal, subjective experiences don't give us a complete or necessarily accurate picture of reality. We are prone to a variety of cognitive biases and perceptual illusions, and our senses can be deceived in numerous ways. Additionally, our experiences are shaped by our past experiences, our cultural background, our beliefs, and many other factors, all of which can distort our perception of reality.

So while it's simpler to consider only our own experiences, if we want to achieve a more accurate understanding of the world, we need to go beyond them. We need to critically examine our assumptions, question our perceptions, and consider perspectives that differ from our own. We need to engage with the external world, despite its complexity and despite the challenges involved."

Spoil-sport.