Think ACTIM Index, then multiply that times 100,000. With that, you'll have an idea of the type of number-crunching that goes on in baseball.
I'm a Luddite on the subject. If the statistic is on the back of a baseball card, circa 1978, then it is a stat worth knowing. Admittedly, I'm still someone who believes you should start your best and not focus such decisions on how someone does against left-handed pitchers in a particular field at a particular time under certain weather conditions (And yes, it gets that detailed now). But admittedly I'm fighting a losing battle; baseball is the ultimate game for stats geeks.
As the game has evolved, the stats have evolved. Decades ago, pitchers were expected to throw the entire game (even if it went into extra innings) and they were often asked to pitch on one or two days' worth of rest. You see some gaudy pitching statistics from the early days of baseball, numbers that can never be matched (Sox legend Cy Young and his career 511 wins--untouchable). The Victorian pitchers benefited from a baseball that limited offensive numbers, a higher mound, and other factors.
Today, pitchers typically work in a five-man rotation (every fifth day they pitch). They are often held to pitch counts and generally do not work beyond 6 or 7 innings unless they have "sick" stuff that is killing the opposition batters. They are replaced by relief pitchers who are measured statistically by (among other stats) Saves and Holds, concepts that were unheard of during Cy Young's time.
I'm not even scratching the surface of the statistical world that is baseball. If you are into numbers and are willing to dive deep into the weeds of metrics, then this is a sport that can accommodate such interest.