What is the advantage of sliding bearings over roller bearings?

In roller bearing for a given movement the roller bearing exhibit a change in pressure
centre from its original position by one-half of its movement based on David J. Lee.
However, with sliding bearing a sliding plate is attached to the upper superstructure and the
moving part of bearing element is built in the substructure. It follows that there is no
change in pressure center after the movement.

Low friction sliding surfaces for bridge bearings: PTFE weave (RRL report)