Conventional rolling element bearings are limited in their acceleration capabilities because of the rotating inertia of the balls in their guideways. These balls start and stop at inconsistent points.
They slide, skip and skid. This causes precision problems, especially for applications with light loads over short distances.
In a direct comparison, porous media air bearings are not hindered by internal inertia in different directions. There are no balls to slip and slide. So acceleration capabilities are high and consistent regardless of distance or load.