Question What is nodeNameCollisionStrategy?

In .fbx.meta file i found nodeNameCollisionStrategy parameter. When i set it to 0 unity importer changes hierarchy names if there are to objects with same in hierarchy. When is et it to 1 - no changes are made.
For example i have fbx with following hierarchy:

Code (CSharp):

1.  
2. Character
3. --LeftHand
4. ----Wrist
5. ------Finger1
6. ------Finger2
7. ------Finger3
8. --RightHand
9. ----Wrist
10. ------Finger1
11. ------Finger2
12. ------Finger3

When nodeNameCollisionStrategy: 1 - there are no changes
But when nodeNameCollisionStrategy: 0 - it becomes this after import:

Code (CSharp):

1.  
2. Character
3. --LeftHand
4. ----Wrist
5. ------Finger1
6. ------Finger2
7. ------Finger3
8. --RightHand
9. ----Wrist 1
10. ------Finger1 1
11. ------Finger2 1
12. ------Finger3 1

I need behaviour without renaming, but i think renaming feature was not just done. What are downsides of not renaming and why renaming is there?

 

And i don't find this setting in inspector. So i am changing it in meta file.