They are likely suggesting that incremental, hypothetical increases in market efficiency appear to come at increasingly steep costs which primarily borne by the rest of society at large.
No, in the best world we do both.
Also, front running is already illegal.
However, stealing money is still stealing money.
> Also, front running is already illegal.
Great! Which means there are sometimes legitimate reasons to clamp down on "hyper-efficient" but socially negative actors.