The rest of your points stand though.
The rest of your points stand though.
Huh? It's not a dongle, it's just a cable. You do need a cable to connect your phone to your laptop.
So many times around me poor iPhone owners couldn't charge their phones at parties because nobody had their kind of cable around, while for microUSB you've got plenty of helpful charger and powerbank owners.
To be honest, lately owners of phones with USB-C were having the same problem, but I guess it's gonna change faster than with Lightning cables.
I can now bring a single charger that can charge my MacBook Pro and my iPhone. I just need a USB-C to USB-C cable and a USB-C to Lightning cable.
Charge my laptop or charge my iPhone or charge both (use the laptop as a passthrough).
It will reduce the amount of stuff I carry, I tend to carry just an iPhone charger while traveling in case I want to bring it with me where I don't bring my laptop, extra space in luggage and weight.
Maybe your idea isn't so great.