“K. I. S. S.”
Uh, we’re talking about Germans here. “Simplicity” isn’t necessarily on brand for volks who use words up to five-dozen letters long.
I see you understand the Germans, have almost certainly worked on German machinery.
The engineer’s credo is: “If it’s working it isn’t complicated enough.”
The French hold this more true than even the Germans.
I think the German term is Kidzinsatenserviche?