Classics are supported on the acting ability of the cast, not on the tricks from the special effects wizard.

We have been so immersed with films having to go over the top with actors that kick box, leap from skyskrapers, show the impact of a car explosion in great detail, in effort to lure an audience.

THANK GOD The Godfather was not filmed now. How much it would have differed. For example in the book it goes into detail of how Luca Brasi did the Capone murders. Hacking off the feet, then the the legs and the knees and so forth. I'm sure some other director like Oliver Stone would have shown this aspect of the film in great detail, but would that have made it a better film?
In my opinion, No.
It's like Key Largo, it's an excellent movie based on the actors abilties and able to convey tension that you can cut with a knife.
...and yes, can stand the test of time.
CAP