alt Hacker NewsFrom the wiki about IEX: "It was founded in 2012 in order to mitigate the effects of high-frequency trading." I can see how they don't want to track internal latency as part of that, or at least not share those numbers with outsiders. That just encourages high frequency traders again.
One would hope for a more technical solution to HFT than willful ignorance lol. For example, they could batch up orders every second and randomize them.