Strange, the most obvious benifit of having lots of coils while would be to selectively use only the ones directly in the optimal location for charging so the c

Strange, the most obvious benifit of having lots of coils while would be to selectively use only the ones directly in the optimal location for charging so the charger - device coil relationship is still 1 to 1, I don't think any electrical engineer would think a M to N setup would be practical. I think it's the combination of slow charging and as the article said; heat production, - and the physical design the charging 'station' requires to account for these problems. A lot of the current 'fast' wireless charging solutions seem to have fans or a design than can dissapate a lot of heat. A flat mat charging multiple devices would need to either have a fan or a hefty heat sink to dissapate all that heat. Apple's very picky about the physical aestetic of their products which throws out a lot of designs that include visable heat sinks and/or grills. Also, if I'm not completely out of the loop, Apple devices tend to excel (relatively) at battery life making wireless charging, likely, an even more niche product for their devices. TLDR, once again Apple's aestetic requirements and the currently, relatively niche market of wireless charging make an Apple manufactured (not just branded like Google might do) a poor product to invest time and capital on and is unlikely to impress share holders.