Organization of scholarship
Scholars often organize the extant literature in ways that anticipate their own contribution.
If, for example, a work introduces a new method of observation, then its authors are likely to organize the existing literature according to the methods that previous scholars applied.
If a work introduces a new theory or applies an existing theory in a new way, then its authors will organize the literature according to the theories that previous writers employed.
In short, the literature review highlights a discrete problem that the authors' research solves or at least addresses.