My answer is that we don’t need a cable. Most of us have one or more USB-C cables for our various devices (even Iphone Boys 😆 )
I use the cable from my smartphone to charge my Ears(1) case.
Although I don’t use wireless charging yet, as I have an OP7T, as soon as I get the chance I will use it.
And for the next Iphones sold and delivered in Europe, they will, according to the EU, have to be equipped with USB-C cables, but it’s not for tomorrow!