A football field has exactly 100 yards between to "end zones" of a specified size, and a specific width. Likewise, the dimensions of a soccer field, hockey rink, tennis or basketball courts are highly specific.
Why are baseball fields different to the point where there are "pitchers'" parks, and "hitters' parks" because of the home run distance and other factors? And, in fact, the "infields" of baseball are basically the same size and shape. So what caused outfields, and hence the parks overall, to be so different?