Stories are not exaggerated. You ever sit down and talk with a former players from the 60's,70's,80's?
They did not necessarily have or follow a throwing routine, on their days off most did nothing, they ate, smoked cigarettes, slept and drank. Their shoulders hurt, many most likely had busted ulnar nerves, but they kept on pitching, regardless, as they knew they would lose thier jobs. The ones who lasted were probably freaks of nature, and you still find them to this day. It wasn't because they had daily routines to maintain their health, and some of the guys from that era confess privately to using steroids.
I have no objections to your suggested routine (with modification if one needs to), especially the shoulder excercises, VERY important. Good suggestions, IMO sounds kind of similar like sons pro routine in season when not rehabbing
. FWIW, most pro pitchers now only shut down for a 2-3 week period then back up, mostly back to conditioning and tossing until a definite routine before they arrive at spring training. Some continue to play fall ball. A bit of info, many of the older vets don't over extend themselves in the off season and don't come to camp in the shape of the youngsters, they don't have to, they've already made the team.
I feel that injuries often occur because the lower body is often overlooked.
As far as bench press, this is something I argue about with son, not necessary. I beleive that lots of pitchers do things they shouldn't, this causes injury and do not spend enough time on loewr body.
My objection was that you claimed that they were healthier back then. Not true.
The big problem in all of this, as I have stated in teh past, my son is a professional and he works hard everyday to maintain good body health, it is impossible, for HS pitchers, especailly those that play multiple sports, to find time each day to do what one has to.
As far as the OP's post, there is a great example of why pitchers get hurt, whether you throw one inning or 7, a reliever or a starter, a pitcher MUST do certain things to avoid injury, not just throw a pen on the side. I think we have all can agree upon that.