the difference between now and then is 1) they throw alot harder now which puts extra strain and 2) they throw alot more variety of pitches and these are not easy on the joints as the motion of the arm isn't natural.
Pitchers have to do all these new things to try and stay ahead of the hitters, the game has evolved so much, it is just the way it is.
Pitchers today throw alot more practices, warm-ups etc......
Also, when you are paying someone 10 million dollars a year, you want his arm to last!!!!
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