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The distance between the bases is the same, but the mound is lower than it used to be. Travel to road games covers longer distances, but that might be balanced out by better accommodations and more efficient methods of travel. I think the biggest difference between "then" and "now" is the sophistication of scouting the opposition and the rise of relief pitching. Pitchers in the bad old days went nine innings almost regardless of the score. The longest World Series game ever (until tied at 14 innings in 2005) featured two pitchers, and the game was won by the above-mentioned Babe Ruth. Nowadays, Cy Young winners can be starting pitchers who don't even amass 20 wins for the season, and it's been more than 40 years since anyone won as many as 30 games in a season.
What makes that significant to me is that back in Ruth's day, a batter would face the same pitcher three, four, or even more times in a game. The more you see a pitcher, the better you're going to hit him. The longer a pitcher throws, the less effective he's going to be. Nowadays, a batter might see the starter two or three times, maybe four if the pitcher is really mowing down the opposition. But even a pitcher who's having a pretty good day is often gone in the sixth or seventh inning. Batters are facing fresh pitchers all the time, and especially in the late innings of a tight game. It used to be that hitting .300 was the dividing line for doing quite well; nowadays, even guys batting .260 or .275 can be considered good hitters. And it's now been 70 years since anyone batted .400 for a season.
I think with some adjustments you can make comparisons between eras, but straight-up comparisons may give a misleading impression.
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