What description are you referring to?
I'm no expert, but in general you can see every shot's chance of success as a weighted sum of the many skills involved (jumpshot, jump range, inside shot, etc). Outside the 3 point line surely the IS doesn't matter at all, and it becomes increasingly important as you move towards the paint, until (presumably) being the main thing under the basket.
With defense it's the same thing. Each player's ability to defend a given shot is a combination of their OD and ID, with different weights depending on how close/far from the basket they are.