A lot of PTs put too much emphasis on the rotator cuff. Often, rotator issues are not actually the main problem and are just a symptom of bigger shoulder girdle problems. If you have an actual diagnosed rotator tear, then obviously this doesn't apply. However, a lot of PTs conclude that impingement and weak internal/external rotation are entirely the fault of the rotators and this is not always correct.
I had a bad weight lifting injury, in my early 20s. I went to a handful of PTs and they all gave me the same advice; do rotator exercises. I was a gym junkie prior to my injury, so I performed all the PT exercises religiously. They did absolutely nothing.
I was in pain for about a year, before I found a YouTube video that discussed the overemphasis on the rotator cuff. The guy in the video stressed the importance of addressing all aspects of the shoulder girdle; traps, serratus, rhomboids, rear deltoids, etc. I started doing YTWLI exercises, every day, and I felt a difference immediately. The first time I did YTWLIs, my shoulder felt really smooth afterward and it felt completely surreal.
You may not be in the same boat as I was, but it is worth keeping this in mind. At the very least, it is good to get a second opinion.