along those lines, am I to understand that throwing at an arm speed that you don't use during a game is good?so, am I to understand that throwing batting practice is bad then?
It's all about perspective. I try to look at things through the lens of what would help young pitchers, not what won't hurt. I look through the lens of trying to improve every time a young pitcher throws. Bill, you've thrown a bazillion balls in your life. Of course it won't affect you. A 14 year old on the other hand has not, and every pitch they throw should be a pitch that can help them improve IMO.