It's a fallacy to think that we as humans are constantly getting better at everything. All the examples you show are where bigger bodies, strength and new training techniques have completely altered the form of the competition. Baseball has changed to some degree but not to the point that basketball, football, hockey, etc. have changed.
Do you honestly think people 100 years ago were worse at chess, pool/billiards, rifle shooting, etc.? I'd argue that pitching is more similar to these types of activities than trying to compare the game of basketball in 1910 to today's game--they aren't even the same game.
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