What makes you think so? The history of East Front in the West is written by the losers who wanted to look good.
It is bad winter, human waves and crazy Hitler by their book.
The fact that they weren’t up to tast isn’t acknowledged.
The Japanese did better analisys than the Germans and didn’t attack for that reason.
The Japanese needed to obtain oil; it is the main reason the “Strike South” mentality won out over the “Strike North” group.
Germany had endured three winters to force Russia to surrender in 1917; I’ve never mentioned that as a reason for their defeat. Hitler was foolish and evil in his methods, but not crazy.