Sean,
Keep up with those exercises!
I had my right shoulder 'rebuilt' back in 2013. It was a mess; tendon tears which progressed to the point that two of them tore completely loose. The second one when I was assisting a younger fellow just starting out; I wouldn't let him do the hazardous part of a Silver Maple takedown. I had just gotten the risky portion below the power lines for him to take over and I gaffed out, and instinctively grabbed the rope from my TIP; loud snap and I couldn't lift my arm.
Surgery, PT, and building it back up from the atrophy and I have gotten back to about 98%.
I don't even think about it unless there's a big pressure drop with the change in weather.