ATMachine said:
neither artist AFAIK has really worked with Wagnerian leitmotifs in the Williams mold

My first time with Giacchino’s work was the soundtrack for the first Medal of Honor video games (~15 years ago).
Go to YT and find the “Radar Train” track from MoH OST.

Not only I can hear we’re on a train, but also “heroic US GI” and “evil Nazis” themes… and I didn’t even play that game level yet! Isn’t this just like good old Williams’ “Indiana Jones”?

Pardon my musical ignorance.