I shoot heavy bows because, I can.
However, I did not start out with heavy bows. I started with a 45# at 28". Over time, I just got stronger and stronger. I, like others, have had shoulder problems. I have injured myself numerous times in Martial Arts and Weight Lifting.
With Archery, I try real hard to use my back muscles, not my shoulder muscles, and my shoulders are just fine.
I could go to my bow rack, right now, and draw an 85# bow back, cold - no warm up, and no injuries. However, I choose to warm up whenever possible. Just trying to be smart about what my body can and cannot do.
But, to your real point - it is a choice. Nothing is RIGHT about it - and nothing is WRONG about it. It is, what it is.
At 47 years old, it's fun. Someday, I won't be able to.
That's why my 66" 85# at 28" Howard Hill Half Breed has this inscription.
In closing, I was shooting with my buddy Jerry Bischoffberger or "Bisch". He jokingly says, "I like my Girlie bows". He shoots 45#-55# bows, and he shoots "lights out". He has won numerous Belt Buckles at 3 D Shoots and has taken many animals in the US and Africa. He is a true Archer and Hunter and impresses the heck out of me with his "Girlie Bows".
So, Light, Medium or Heavy, it is just a choice.
Matt