FCCS: Alternate Hierarchy does not share base members with Seeded Account Dimension query

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Hi all

We have a client where they have created an alternate hierarchy with NON Shared based members under the alternate hierarchy. I see that this is not what was recommended by Oracle a while back:

However what the client has done is create many FCCS_xx rules targeting certain accounts. It is possible that they have the accounts created directly in the parallel hierarchy but then, the treatments that FCCS would carry out automatically, they have created themselves via scripts (FCCS_xx).

Could someone from Oracle confirm if this is an acceptable design (We just started working with this client and this is a new approach for us). It is working but I would have thought the 2 hierarchies needed to share base level account as a minimum.