Worth remembering that Ike didn’t just do that because Ivan was more accepting of the horrific number of casualties that taking Berlin would possibly involve, but also because Ivan had recently repeatedly proven that he was the grand master of urban warfare bar none. The taking of Aachen in 1944 by the US had been Stalingrad Diet Lite and it left a bad taste in US commanders’ mouths.
Towards the end of the war the Soviets were advancing behind a rolling artillery barrage; they weren’t intending to take Stalingrad-level casualties again. They weren’t masters of urban warfare; their commanders simply forced them forward under pain of death.