Recently a side comment came up about why modern pitchers don't start 40 games a season like they used to. The question intrigued me so I did a little searching. The results surprised me. Mostly I used the Stathead tool at baseball-reference.com, and the most useful table I constructed is this:
https://stathead.com/tiny/SBDaM
Since the modern era, 1901 and forward, it's never been the case that pitchers in general were regularly making 40 starts.
For periods of years, the major
