> They had some physics at school and from their point of view the cable is just a bunch of copper and it should absolutely make no difference for how fast thei

> They had some physics at school and from their point of view the cable is just a bunch of copper and it should absolutely make no difference for how fast their phone charges. Even if it is just a bunch of copper, there is thin and long copper and thick and short copper. I had a cheap, long micro-USB cable that was too thin to deliver 2A at 5V, my phone couldn't charge correctly. Using the Ohm's law, I could calculate that the voltage drop was enough to get it out of specs. The cables you need to transport power at 5V can be surprisingly thick, and that's a reason why fast chargers are usually higher voltage. I ran the calculation to power a 5V LED strip over 10 or so meters, and came to the conclusion that I would have needed utility-sized cables.