Why are you giving me Shoulder Blade exercises if I have Shoulder pain?

Here a picture of a shoulder blade (scapula) exercise:

one arm wall push up

If I were a patient, I'd be thinking, "those therapists sure are giving me a lot of exercises." The truth is, the shoulder blade has to elevate and rotate up for your arm to reach all the way up overhead.

scapular elevation and upward rotation

shoulder impingement

So, in fact to really get better from shoulder pain a person needs BOTH shoulder and shoulder blade exercises.