TFA says that this will save"$54.2 million to $77 million annually", which does not sound like a lot in the tens-of-billions that these companies make.

TFA also says that a different rule means that they still have to "execute trades with the most favorable terms for their clients, making the trade-through rule superfluous". Can they do that without the extra data and connections that are being scrapped by this rule change?

It sounds as if this risks giving the platforms the opportunity to implement front-running by other means, transferring billions from the clients to the platforms. And, to be blunt, having only a single political party on the SEC does not fill me with confidence that anybody was in the room to assess that risk.