Somebody enlighten me... what was the big deal about an Apple wireless charger? Like, what was somebody waiting for this instead of just using something else? It's not like something that actually makes a physical connection with your device to charge it—what was the expectation that Apple was going to do something different or special?
What would have been distinguished the AirPower was the ability to randomly place the devices anywhere on the mat, and still have them charge properly.
Wireless chargers are sensitive to proper alignment; the coils in the charger and the coil in the device have to be in close proximity (in every axis, including z) for the inductive effect to optimally occur. Move that device slightly off the sweet spot, and it will stop charging.
Some existing chargers try to overcome this with multiple coils, with a slightly overlapped single layer, to lessen this need. That makes the sweet spots larger, but still doesn't allow for random placement.
What Apple was purportedly attempting to do was use multiple layers of coils, and surprise (!), found that it couldn't overcome the laws of physics. The normal process of inductive charging generates heat, and any metal object within the range of the coil also will "react" with it, such as keys, coins, etc, but also including other coils. Unintentionally creating a "hot plate" on one's desk is undesirable, so the charger has to somewhat intelligently detect unintended foreign objects and be conservative in shutting itself down for safety. The Qi charging/control protocol handles this.
Apple may have tried to overcome this with optimized coil placement in multiple layers, and some sort of sophisticated switching, but couldn't make it work.
The MRF peanut gallery will have its typical fun, but this was an engineering problem that would have been difficult for anyone to solve, not just Apple.
Edit--to add some perspective, those who say that their "XZY Charger" can already do this -- no, it can't, and it's not the same.
A typical wireless charger now on the market has a single coil. Some have two, or three, but none have more than a handful, at most. AirPower was rumored to have 22, which compounds and illustrates the complexity of the problem.
And, even if Apple was able to get it into a working state, where it performed decently and didn't serve as a mug warmer as a side function, and stopped leaving burn marks on the surface it rested on…that doesn't mean it would have necessarily passed muster with the FCC. These devices also generate RF, and must comply to interference regulations.
Apple can be rightly faulted for announcing an unfiniished, untested product and failing to successfully bring it to market. It can't be faulted for trying and failing.