Need to give this thought, but ww2 was the last time that combining arms was an even deal and unknown odds.
Tanks played a role, aircraft, artillery, foot soldiers, ship support, subs, etc.
There’s this sense that even if both sides did their best, you don’t know the outcome of any engagement.
After ww2, war became much more technological, and as long as the side with the advantage didn’t fuck up, they were gonna succeed.
So war movies afterward didn’t have the WAR part as an active plot line… they had to focus more on the psychological aspects, etc.
That might play into it.