I did undergo repair shortly after that post. I was about 30 at the time. I talked my orthopedist into the subscapularis-sparing approach (open, not arthroscopic), which he was able to do, but was kind of annoyed by it as it made the operation much more difficult. He seemed pretty concerned about my axillary nerve post-op, but fortunately I didn't have any deficits. I had it done by a shoulder specialist at a large academic medical center, which I would recommend for such a rare lesion. This is not as common as a rotator cuff repair. You would probably be lucky to find a surgeon who does 2-3 of these a year.
The recovery lined up with my pre-op expectations above, with a lot of sling time followed by a LOT of PT focused on stretching and strength. I was able to regain full range of motion in that period and retain it to this day.
With the above, and life getting very busy about a year post-op, I have never climbed as I did before. I probably could get back to climbing 5.10 but I was pushing 5.11c at the time of my injury, and I don't think I could pull that hard again without putting the repair at risk. I had more pain pre-op than post, and over the years the pain has faded to the point where I notice a twinge every couple of days, and with certain movements, but never feel the need to take anything for it.
I am a bad tennis player but have never had trouble playing tennis after my surgery. I would not be thrilled to go kayaking, but I went rafting a few times last year without too much trouble. I do some yoga with no trouble.
Overall, I'm happy I went through with it. It was a tough recovery but my shoulder is much better off for having had it done. Good luck to you.