Here is an interesting article about draft trends:
https://theathletic.com/998546...-the-2019-mlb-draft/
-pitchers are getting older, hitters virtually unchanged (less HS hitters drafted)
-pitchers are throwing harder but peak velo has not changed that much
-players are actually getting lighter looking at their BMI. They got bigger until the mid to late 00s but since about a decade they are trending lighter. A reason might be a trend away from corner/1b guys (even though there is an exception like vaughn/schwarber in most years) to multi position flexible guys (because everyone wants to play ben zobrist type positionless baseball)