There’s much about the game of baseball that never changes. Three strikes and you’re out. Bases are 90 feet apart.
Then again, some aspects of the game are constantly adjusting to the times. Witness the amount of defensive shifting going on in Major League Baseball this season.
You could say that one thing that never changes is that pitchers try to throw fastballs by opposing hitters.
But the arsenal of pitches the pitchers use beyond the fastball seems to differ from one era to another.