This article is written for a particular audience. The people selling it to law firms are going to pitch efficiency.
As for pitching law firms on efficiency, that's actually an uphill battle in many ways. Lawyers bill by the hour, which means that there is not a natural demand for tools that increase efficiency. Post-recession, there is an increasing amount of fixed-fee work, which helps on this front. But the bread-and-butter for many firms (especially prestigious ones, who don't have to accommodate fixed-fee arrangements) is hourly work.