It depends on the details of the surgery, but this may have helped GP heal a bit faster.

While testosterone is not well-known for helping to heal ligaments/tendons, some HRT compounds (such as nandrolone) that are occasionally prescribed by doctors/urologists, have a lot of anecdotal accounts of reducing perceived joint pain.

Maybe I’m out of touch but I would be astonished to find that it was even remotely close to “nearly everyone” for recreational hobbyists over 35.

The level of injury is just not as high as you’re suggesting for people who aren’t training to be elite competitors. I’ve had perhaps one “small” injury (muscle pull, joint overextension, etc.) every six months or so, reasonably consistently for the last ~7 years of BJJ / judo which I do three to five days a week, 2-3 hours a day.

I had nearly zero ability to lift the arm under its own power at one week and limited (but good for one week) flexibility. To be clear, I did not engage in any actual drilling or movement of that shoulder in training for perhaps a month. It was in the sling, tightly affixed to my body. I started with one-sided warmup movements and drills and progressed as I felt able.

By a month I was helping newcomers by helping them with some details of techniques. Due to being unable to lift the arm under its own power, I would “crawl” my arm using my fingers where it needed to go to show them. This was with zero actual resistance, but I was at least using the arm: moving it, contracting the muscles, working through scar tissue, and getting blood flowing.

Again, I 100% acknowledge that I exposed myself to greater levels of risk by doing this. I did try to mitigate that risk as best I could, but that never drops it to zero. And while I was pushing things, I was also adapting things day by day to what I realistically felt my capabilities were.