How does this differ from: "You're 100% entitled to do what you want with your own property but please consider the view that gold is an important and finite resource and should be put to good use"
In the early 'net there was an ethos that the domain names system was an identifier service, not property. A domain name was an identifier that could be requested as needed, and in return for payment of a nominal fee would be delegated to the requester. The requester should then, if following netiquette, relinquish the identifier when no longer needed.
If instead the initial registration was taken as the sale of a commodity, the original way they were distributed didn't make a lot of sense. It would've made more sense to auction them off at fair market value, rather than registering new domains first-come/first-serve for a nominal fee.
I suppose that ship has long since sailed, though a few ccTLDs still retain that position, at least officially. DK Hostmaster's policy statement says that Domain names cannot be purchased, but borrowed. In other words, by registering a .dk domain name, you have acquired the right to use it. However they've given up trying to enforce that, and allow this "right to use" to be fully transferable, making it quasi-property. They still maintain a vestigial waitlist by which you can register to be next in line to receive a domain when the original owner relinquishes it, but this is in practice no longer used for anything that's in demand.
Or any other commodity.