I do think a greater discussion of lifting/physical fitness to strengthen your shoulders is worthwhile in the world of bow hunting. regardless of your draw poundage, keeping your shoulders/arms/etc strong is a long-term investment in overall quality of life.
you are 100% right on this. i've done things in my life and now both shoulders are damaged to the point of needing surgery that i refuse. my pitching of baseballs to my kids days are over but i still do all i can to strengthen my whole body. to be able to smoothly draw and let down in a saddle, i pull 47# @ 28.5". 575gr arrow and limited kill radius and i'm as tickled as a peach. it's ok if deer walk by at 25yds. fires me up to get on the X tomorrow.