@Onkel: Explain to me how going from 1/2 Maxim survival to 3/4 survival is connected with arc.
I gave you a list of things at which the MG42 performs better than the Maxim. If you limit your comparison to the 3/4 survivability one might think the MG42 performs poorly compared to the Maxim. But if you include all the other advantages you will find out that the MG42 is much better than the Maxim and the survivability just shifted it even more into that direction.