If the game servers do let you transfer ownership, then why do you need the NFT? If they don't, then why do you need the NFT? If I sell the NFT of my game swor

If the game servers do let you transfer ownership, then why do you need the NFT? If they don't, then why do you need the NFT? If I sell the NFT of my game sword but my character still has it, what's the NFT doing? If I trade my sword in game and don't bother with the NFT what purpose would the NFT have?