We can already achieve this without blockchain technology! Indeed that's not the way the system works, but that's not due to technological limitation. What makes you think that once "permissionless stock markets" are available on the blockchain then secondary derivative markets won't spring up, making the ownership situation as murky is it currently is for stocks?
In principal, yes, the trusted parties could have stepped up and implemented a more transparant and automated system. No, they did not need to base such a solution on a blockchain. But the reality is that they were not inclined to change the status-quo, and now we find ourselves in a world where every relevant financial system is looking at, testing, or in the process of rolling out a blockchain based solution.
For anyone asking where the value in the technology lies, the proof is in how seriously the large players [1] are taking it.
[1] just one of the many public facing examples of a blockchain-based stock market (under the CHESS replacement program): https://www2.asx.com.au/markets/clearing-and-settlement-serv...
What can I do, today that should make me want to buy the crypto to do a thing with crypto. Rather than buy crypto to hope for an increase in value.
Both are applications of NFTs and both have significant players developing them.
I can elaborate more on these two applications if you want. Currently on mobile.