While publishing a KPI, if an Expression measure is dragged, the associated base measures are not accompanied. Why?

While publishing a KPI, if an Expression measure is dragged, the associated base measures are not accompanied. Why?

Most of the times, these base measures may not be required to be shown in the KPI, hence these base measures should alternatively be hidden using the Show/Hide feature. To prevent this additional step, when an Expression measure is dragged, the associated base measures do not accompany.