Don't think it's particularly innovative really - a lot of electricians in the UK are now installing the Quinetic - https://www.quinetic.co.uk/ - system and it works really well in terms of wireless switches.
Mostly it's not to save the cost of the actual cable - but to save the install cost on an old brick building, where installing a new switch requires fairly extensive work to the house and brickwork.
Mostly it's not to save the cost of the actual cable - but to save the install cost on an old brick building, where installing a new switch requires fairly extensive work to the house and brickwork.