Ok, but is there any reason that you think a decentralized AMM would be more efficient than an equivalent centralized system vended by NASDAQ? Of course not, the latter would be faster and cheaper. It just doesn't exist yet. The former is boat anchored to the blockchain making it infinitely less efficient and more expensive.

You're just describing an opportunity that exists in classical markets. No reason someone couldn't build it, faster, and more efficiently.

Blockchain is an inefficiency and a liability.