The important thing here is 'chip scale'. This is a device that can be integrated into relatively small packages, enabling a number of use cases. To give an ex

The important thing here is 'chip scale'. This is a device that can be integrated into relatively small packages, enabling a number of use cases. To give an example - direction finding of the source of a radio signal using multiple drones. This requires the drones to have extremely good time synchronisation so that the time of arrival at each of them can be compared. With a CS atomic package that can be a trivial exercise, without it you need to rely on an external timing reference of some form (e.g. GPS).