Well this would be a problem with wireless charging in general, not specific for this product. But thanks to the 15w fast charging, if you are in this situation, you don’t have to wait long till you can use the phone again.
Apple's own MagSafe charger is design specifically for this... phone can still be used easily while charging.
Say you're at the airport, you want to charge the phone.
1. Tiny GaN charger and a 2m Lightning cable. Charges with 20W, no hassle.
2. You use this monster and patiently wait until the phone gets some juice and then you can use it.
"Neatly designed industrial trash" is a really good description for this.
I agree, to each its own... but please tell me a situation, where this is better than a cable?