The wall switch and the light that it controls needs to be in close proximity.
Any button can be assigned to control any lighting circuit.
Classic switches can have at most 3 switches in one gang, but digital switches can have as many as 8, thus they greatly save on wall space.
Each button can be assigned to control any circuit; moreso, they can be made to control entire groups or patterns as well.
To achieve better energy savings, the lights should be grouped into more circuits, but doing so would also increase the number of switches, making it confusing to know which controls what. Digital control shows a better way by allowing arbitrary circuits to be combined into various patterns, allowing the user to control the lights by the task desired, thereby greatly reducing the complexity in operating the lights.
Since digital control is not dependent on the physical layout of the wiring, the layout of the lights can be virtually reconfigured to match the change in the actual use of the space.
For large spaces, if switches are gathered only in certain locations, then it is unavoidable that the operation will need to run all over to control the lights. But with digital switches, control of the lights can be assigned to multiple switches, one set can be placed near the workstation and others duplicated in strategic locations.
Since digital switches are linked together using a digital network, increasing the number of switches only adds a short segment to the existing wiring network.