The reason you don't hear much about this is ... well bitcoin (purposely) does not have a robust enough smart contract architecture to make NFTs easy. Bitcoin is for censorship-resistant payments, not for storing hashes for jpegs. But there are other second-layer protocols that have better support for NFTs.
NFTs around Bitcoin:
Counterparty
Liquid Network (see Raretoshi.com, Infinite Fleet (game, with NFTs))
RGB
RSK
Other emerging protocols that enable tokens on Bitcoin
There are NFTs on bitcoin they are just not a focus on this ecosystem because they are a distraction and there are much more important things that drive bitcoin adoption than NFTs
Money is fungible and the decentralization makes it impossible for someone to take it away from you or to censor you.
This is not the case for NFTs. Yeah, your property rights can be recorded decentralized. But when someone (e.g. the government) takes away your house it is gone - no matter if you wrote it into your shitcoin blockchain or not.
NFT is not a shitcoin, it is a non-fungible token, which bitcoin can also be with 2nd layers.... You know Lightning is a 2nd layer, right? Do you hate the lightning network because it's a "shitcoin"? What are you doing here then?
Why does this need to be decentralized?