Well for one it explains why some HFT actors are so vehemently opposed to IEX's HFT-limiting exchange application, as investors leave any venue that still permits HFTs, and go to alternatives such as Aquis and, if its application is granted, IEX.
Comments like these... they just show you have no idea what you're talking about. Investors are perfectly free to trade on the IEX ATS all day long in its current incarnation.