Hard to compare eras. People say the players from a previous era couldn't play today. Give players from yesteryear today's facilities, training and medicine/surgery and the best of that era could play today.
Conversely put today's players in an era with poor facilities, no trainers or modern medicine and see how they would do. I looked up Babe Ruth's final season with the Boston Braves. They played 36 double headers. 72 games were part of a double header.
https://www.baseball-reference.com/team ... ores.shtml
Ride a train from city to city. No air conditioning on the train on clubhouse. No trainer to help with minor injuries. No surgeon for a major injury. Play nearly half the schedule as double headers. Then work a job in the off season because the baseball salary wasn't enough to pay the bills.
How many of today's pitchers have had arm surgery? They would have been forced to retire back in the old days. Ohtani is an example. Without the DH he would have to retire. Can't play with a torn ulnar collateral ligament. Even first basemen have to be able to throw.
There was also no umpire stopping a pitcher from throwing inside, no batting helmet and no plastic shield on the elbow, hand, foot.