On the basis that the cryptography remaining unbroken and the protocol-genetated incentives creating a validator set too large to coopt are more reliable trust assumptions than the trusted third party controlling a traditional dark pool being competent and trustworthy.

>>It's not: it's the fault of gas making it impossibly expensive to use the most basic tool in execution, splitting your order into smaller trades and applying logic to when you choose to trade.

Yes that makes sense.