It's easy to connect multiple wires in parallel. Because multi-strand copper-core flexible wires are easy to be articulated and combined;
If it is a single hard copper wire, it is more difficult to tighten it by hand.
Now there is a gadget called: patented electric twisting machine, which tightens the thread in half a second. It is a lucky star with multiple strands connected in parallel.
There is no need to worry about not screwing tightly and hurting hands, and the quality and efficiency are improved. Engineers can understand the following picture at a glance.
Actually? No matter how many words you write, you probably don't want to read them. It's easy to see. Just look at the picture below, and you can easily tighten it by pressing the switch for half a second. The method is simple. Why twist it by hand? It's inefficient.
If you just type on the keyboard, you can praise it or keep asking questions.