Never share VS store - DataStorage

While deploy an application, one of our vendors stick to  set "Never share" to  most of members, include all level0 members.

does any influence on such case ?  eg : performance or other potential problem ？

we can read from doc :

Understanding Implied Sharing

The shared member property defines a shared data relationship explicitly. Some members are shared even if you do not explicitly set them as shared. These members are implied shared members.

Essbase assumes (or implies) a shared member relationship in the following situations: 

A parent has only one child. In this situation, the parent and the child contain the same data. Essbase ignores the consolidation property on the child and stores the data only once—thus the parent has an implied shared relationship with the child. In the following example, the parent 500 has only one child, 500-10, so the parent shares the value of that child.