Even disregarding material, it is literally less efficient due to transmission losses, and it’s only “wireless” in so far as you have a wireless dock to drop your phone on that is then attached to the wall just like a regular cable. The only thing it does is make it so you don’t have to plug a cable in or use a magnetic cable attachment, but there isn’t really any convenience gain over just having a charging cord especially if you have a super long charging cable for your stationary spots in the house.
I really like the magnetic charging port plug adaptors for situations like that, but personally, if I’m jumping up and down from my desk at work or something and have my phone plugged in, I’ll just leave it on my desk while I’m away. And if I’m not coming back to it for a good bit, the extra half second it takes to unplug my phone is more than worth the more efficient power transfer, imo.
But to each their own.