That's the theory with all charging, isn't it? But I'm talking about while travelling or all those unexpected circumstances when you find yourself needing a charge when you're not at home.

One night recently, I managed to get locked out of my flat, after midnight, with nothing but my phone in my pocket. On about 15% charge! Thankfully that was enough to book a hotel and buy a lightning cable (and a toothbrush) at a 24-hour convenience store using Apple Pay, enabling me to recharge the phone on the hotel's USB charging sockets. If I'd needed to find a wireless charger I would have been totally screwed!

I suppose wireless chargers will become similarly ubiquitous if they're the only way to charge phones. If you can expect to find wireless charging in every hotel room and every train seat then it's not a problem. But I suspect that's a long way off.