Over the years probably every aspect of athletics has changed. Apparel, equipment, stadiums, fitness, diet, training, strategy, etc. Even cheating. Football used to be 3 yards and a cloud of dust, now its aerial bombardment. Baseball used to be hit the ball and run around, now its stand around until someone goes downtown. Stuff changes all the time to make comparisons across eras pretty tough to do. But each athlete has the current playing field to compete on and teams strive to win in the environment they're given. It's what makes athletics fun to watch (except in-game video reviews).