You still need the centralized classical PoS system to make sure that these assets are actually lawfully owned by the right people.
Also for plenty of big companies, a decentralized system is dimetral to their standing. I 'trust' visa.
"For example, a bank could automate processes like administering complex lines of credit using smart contracts and use fiat-backed tokens to release payments when payment terms are met." this even reads like a weird joke. Imagine some expert being needed by a smart contract to evaluate if a flat has the estimated value. The expert needs to verify themselve against a system to even be able to add this trusted expertise onto the blockchain. This requires an additional trust anker because again blockchain doesn't add any trust at all and than nothing is left of the original blockchain besides a standardized way of publishing some information decentral.
You could have done this 20 years ago with public/private keys, certificate authority and ah yeah i think you know how our ca system works right? :P
Edit: "There is a growing ecosystem where tokenized real-world assets are being issued across multiple permissioned and public blockchain networks. " thats even a better joke. Cross blockchain transactions are not a solved problem. Peple lost billions due to this... Apparently who ever does this project in Visa has 0 idea what they are doing. Dead on birth