This is the key. The majority of players, if given enough time and space, have at least reasonably reliable range out to at least 15 feet. But the difference between Aldridge and Duncan taking a mid ranger is not the same, even if the result ends up being the same.
Teams are terrified of Aldridge's jumper (not just for his proficiency, but his high/quick release), to the point that the big defending a pick and roll with him will either "hug" him, or they'll have the perimeter player one pass away either stunt or altogether rotate over. Aldridge has become adept at catching them in rotation by immediately swinging or skipping it to the open man on the weak side, where there's a momentary 3 on 2.