The argument for changing Magneto’s ethnic and cultural background in order to make his experiences/perspective more “modern” is just wrong. That idea treats anti-semitism like a solved problem when it absolutely is not. All anti-semitism did not end when WWII did. Magneto bears relevance to this day, and there are plenty of ways comics have explained away his age. The MCU can certainly do the same. You cannot have Magneto without him being Jewish. You cannot have Magneto without him being a survivor. That is something I will not negotiate.