You can't beat physics. There is no possible way to make wireless charging as effient as wired charging, end of story. Yes, you can improve the efficiency to some degree with incremental improvements in materials and manufacturing quality, but the real impediment is the physical lack of an iron core in the "transformer". The transformer in your wired charger that brings the mains power 110V/220V/240V (depending on your country) down to the 5V for your devices has a core that is a loop of material (such as iron), and two wire coils, one wire coil connected to the mains power, and one to the 5V out. In a wireless charger, there is no looped core, due to the fact that both wire coils are in two different devices, one in the charger, and one in the phone. The looped core in a normal transformer is made of a material such as iron, that is efficient at channeling the magnetic field that transfers the electric field from one wire coil to the an electric field in the other wire coil. Without this core, the efficiency is dramatically diminished. And even with this core, the efficiency isn't as good as simply a wire carrying the charge. So, in the wireless charger, there is actually two transformers, one bringing mains down to 5V, then the second one that transfers this 5V from the charger to the 5V in the phone. So not only do you have an inefficient transformer that has no joined looped core, but it is an extraneous second transformer, so you have a double inefficiency. In summary, you can't beat physics, and wireless charging will always be inefficient. The only thing it's efficient at, is improving the profit margins at Apple. It most certainly doesn't do anything good for the environment.
Even more insane is the idea of long distance wireless charging. This seems to me to be pure fantasy dreamt up by con artists trying to scam money out of investors.
