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The motivation for this feature is to give NFT owners the ability to sell or trade their tokens without owning ether.
Right now, NFT owners can sell their tokens without gas by using a decentralized exchange (e.g., an exchange built on 0x Protocol). However, these exchanges require that the token owner sets approval in the ERC721 contract for their exchange contract. A user without ether can't set the approval.
If the ERC721 contract supported meta transactions for the setApprovalForAll() function, a user would be able to both receive a token and then sell it without owning ether because the exchange could securely set approval on the user's behalf. This feature could enable an improved on-boarding and user experience for people without ether who are interested in NFTs.