One use case is a decentralized name registry that is scalable and works. Other obvious use cases are NFTs and issued assets, which I personally don't have a use for, but there is clearly market demand for it, so they might as well do it on a blockchain with no premined shitcoin and paying fees to Bitcoin miners.
These 3 use cases are being done on Ordinals right now, which is a waste and unsustainable.