>NFTs have no mechanism to define originality, or even atomicity.
It always links to a wallet and thus proves originality. You're right, anyone can mint a mona lisa and claim it's a van gogh, but if it wasn't minted using van goghs wallet, it's not van gogh.
>It isn't a copyright grant, a contract, legal ownership, or even a binary container
Say i have an octopus NFT. I am the only person who can transfer ownership of my octopus. you don't need 'Legal' ownership, this is real 'ownership' of my keys. You can show that this EXACT Octopus sold for $50m and was previously held by a wallet associated with mark cuban. Yes, some random can make a duplicate octopus but it won't be created by my wallet, mark cuban wouldn't have previously owned it and it wouldn't have previously sold for $50m in the metadata.
>Owning a rare gun skin in CS:GO is much more "real" than an NFT is.
How many people own the 'Rare gun skin in CS:GO? would you trust the company if they said only 5 people owned that rare gun skin? What's stopping them from infinitely minting the rare gun skin and saying there's only 100 of them. Would you be willing to pay more for the CS Skin if only 100 people could have it, than if it was inifinite? If CS:GO was to adopt a standard blockchain for the sale of their NFT's, you could see exactly who had what skins and what the bidding price is for them. Complete transparency in scarcity.