At first, I was going to slightly disagree with you until you provided your definition of trigger control. It's more of an aha moment now. Shooting well really is about isolation, isn't it? Isolate an acceptable sight picture from over aiming. Isolate the trigger press from the rest of your grip. Issolate letting recoil happen from pre-ignition push. I'm sure there's more.
I definitely suck at Step 2 and Step 3. Lack of skill for step 2 is more evident when I'm trying to shoot precisely. Step 3 is more evident when shooting quickly.
You just gave me a new practice focus for the rest of the winter.