Seeing as you seem to have read tons of history on WWII let me ask you this.

Is it fair to say that the Normandy landings were more aimed at stopping Russia taking all of Western Europe than defeating Germany and this constant pushing of the narrative that they were responsible for the victory is the usual nonsense?

I've seen the stats about 70-80% of all losses (depending on which source) being on the Eastern Front and even Max Hastings had to admit, slightly paraphrasing, "It's not entirely unfair to describe WWII in Europe as a war between Russia and Germany with minor skirmishes elsewhere".

I've also read that the industrialists (Krupp and the rest, I think...) in Germany had told Hitler than it was curtains as early as the end of 1941 unless they could change the production/replacement rates and this is often given as evidence that the most important thing the Brits did in the war was the Arctic convoys to keep the Russian factories churning out meat for the grinder of the East.

Obviously, that's all generalised massively but is it along the right lines?