I don't like this idea that bitcoin is not physical. Digital IS physical. Those 1s and 0s represent a physical distinction. Bitcoin is math physically written onto the drive of my node. I can hold it in my hand. I can touch it and feel it. My senses are not sufficiently sensitive to be able to read it from the drive, but neither are they sufficiently sensitive to guage the purity or weight of a gold coin.
Bitcoin is as real and as physical as anything you've ever touched, seen, heard, smelled or tasted.