Not disagreeing with you on the Arnie thing but, you could've used another actor instead of Hanks as an opposite example. I say this because he was, alongside Arnie himself and other guys like L. Jackson, Bruce Willis and Tom Cruise, one of the if not the most famous actor during the 90s. In fact, I think he was one of the top 2 box office draws of the decade.Arnold Shwarzenegger was never going to win an Oscar, but he had so much charisma and presence that it didn't matter. He was the go-to guy for over-the-top action movies and crazy comedies.
Try casting Tom Hanks in The Predator or The Terminator and see what happens, lol
Someone like Daniel Day Lewis, Dustin Hoffman or Gabriel Byrne would've made for a more apt comparison.
Btw, I'd dare argue doing too many wild comedies hurt Arnie's brand to a small extent. He was super big in the late 80s to mid 90s, then he started doing more silly movies in a row like Junior, Jingle All the Way and Batman & Robin and he wasn't the same after that. He was still a big deal, but it wasn't the same.