But if you know you won't need to charge them simultaneously, then you can only carry one cable.

For instance, I'm happy that my new laptop can charge on usb-c, so now I don't need you bring a charger for my switch and a different one for my laptop. I just take the smallest one and charge my laptop and switch with it (but not at the same time). I'm happy to know that I will be able to ditch the lightning cable for my next apple smartphone and only keep a single cable for my three devices.