Because they were trying to do multiple device charging that you could put devices on anywhere rather than one device in a rough area or multi devices in specific places, as I understand it.
Even so, sounds a bit weird. Induction charging has been around for 20 years or more (Oral B toothbrushes for example). Getting things thin enough was the first major hurdle. I know almost nothing about the tech though so I'm probably missing something fundamental.
Because they were trying to do multiple device charging that you could put devices on anywhere rather than one device in a rough area or multi devices in specific places, as I understand it.