NFT Showroom is awesome! We love what they're doing and hope to support it in the future. NFT Showroom is specifically for trading and collecting art. Opensea (and NFTMart as it grows) have NFTs for games and whatever else in addition to art. Much like opensea.io, NFTMart doesn't create the NFTs, make the art showrooms, or design the games. We're just a place to buy and sell these things.
@nachofigx is very happy that you mentioned opensea.io 😄
It is our hope that making things easier will provide exactly the kind of synergy between markets and creators needed to help grow NFTs on Hive. For opensea.io, there is a definition on chain for NFTs that it can utilize. As Hive solutions are either Hive Engine or proprietary, it will take more effort to do and can't be simply done for all NFT types at once. If the super smart guys get NFTs directly on Hive, then we'll have those for sale on NFTMart too :)
As long as you figure out how to sell NFTs minted on NFTShowroom, -- Then you would be like opensea for hive.