I love weighted balls. I use pylos to warm up. Then catch play I'll use weighted balls at lower intensity to start and just get my arm working right. It also helped my exsternal rotation a good amount.
The heavier balls are helping me correct my pushy arm by teaching me to relax the arm and feel it flip up deeper into scap retraction. I personally don't like throwing anything heavier than 14oz.
We've been on this for years, and exactly as you put it, it's used for a specific purpose, and not trying to ask too much out of a single tool. In our case, it's to slow down the throwing motion and feeling the arm action, without the player having to actively think about going slower. Max 20 throws out of the 100 or so throwing budget in a practice.
As a physical therapist and parent of a high school player, I have used weighted ball training with athletes. I think your generalization at the beginning is a little off. If used properly then it is a good tool. If used incorrectly, then yes it will cause injury. I teach that there is no such thing as injury prevention but mitigation. I do love this topic and using this within the rehab setting to help athletes get stronger and improve their ability in the game. Keep up these good long educational videos.
In the end he didn't say anything important, in short, you know how to indicate a program of heavy balls and for any pensioner, I mean an hour and a half for that.
