Except its not a real argument at all. Since there is practically no good reason why you should ever need to do this. And lets be frank: what you mean is you can't use WIRED headphones while charging. There are many USB-out audio scenarios such as speaker docks, home theatre, car audio, where charging and listening to music just happen together through the same cable.
The only thing you "cant" do is tethering your head to the wall like some kind of _____ fill in the blank.
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I can tell you exactly why. Here it goes, pay attention: No one cares, no one needs this, no one misses it. It is nothing but a troll's trump card and weak one at that.