The day Willie Mays hit a walk off home run and was essentially relegated to the footnotes

[patphil]

1. They come from a different era of baseball, when pitchers worked a lot more innings.

Spahn is 8th on the all time list of most innings pitched, with 5243, for an average of 252 innings per season.
Marichal's career was a lot shorter, and he only did 3507 innings, for an average of 257 innings per season.
For prospective, there are only 2 active pitchers who have just barely achieved 3000 innings:
Zack Greinke, and Justin Verlander.

I doubt anyone will see 5000 innings in a career again.

Source is:

https://www.baseball-reference.com/

I also looked up complete games; Spahn had 382, #21 on the all-time list. There isn't a single active pitcher among the top 1000, and that goes all the way down to 43 complete games!
I doubt if all the active pitchers in the major leagues today have a combined total of 382 complete games.