Most jumper cables are simply too thin, in combination with being too long. Combine this with today's "I want what I want and I want it now mentality" and an easy procedure becomes stressful for the jumper.
A quality set of 4 awg cables should be able to jumpstart a vehicle instantly without the donor car even running. Unfortunately most cables are 8 awg, or even 10 awg with really thick insulation.
I recently had an awful experience when asked to assist somebody who had no jumper cables. I had no cables per say, but I have some 10 awg cables with alligator clamps from my 20 amp air compressor and 25 amp battery charger that I can join to make a poor set of jumper cables.
I informed the person that I could help, but it would likely take in excess of 20 minutes for the thin, long wiring to pass enough current to allow starting.
I hooked it up, and the guy instantly jumps behind the wheel and tries cranking it.
I saw his intent and rather than have him melt my wires, I disconnected them, and he got all PO'd.
We exchanged some words, and long story short, I took my cables and drove away, because If I didn't leave, I was gonna send the guy to the emergency room.
Can you imagine cursing at someone who was trying to help you?
I always try to help when I can, but some people........