> How would the blockchain saying that you "own" a domain make you own it more than currently?
There would have to be consensus that the particular blockchain is the source of truth for who owns which domain.
> It is impossible for the blockchain to prove anything about anything that originates from outside of that particular blockchain.
Yes, and this is something that wouldn't be necessary with blockchain-based domain names. It would not need to know about anything that originates from the outside.
> This is the reason why wanting to apply blockchain to everything such as land ownership is laughable and shows how little blockchain fanatics understand about the very technology they praise.
I'm far from a blockchain fanatic and using blockchain for land ownership is obviously laughable to me.