I have long said similar. Why simply exterminate people when you can work them to death as slaves? Germany has a finite population that is magnitudes smaller than the totality of the nations they faced. Their able bodied men we all in the military. They were desperate for manpower to keep the war machine turning. The Germans definitely committed atrocities but the gas chambers werent one of them. This is a case of the history being written by the victors and if you study the aftermath of WW2 and the continuing informational framing that sprouted from the initial lies, you will realize who the victors really were.