Why Linking an "Assigned Part" is a pre-requisite to release a "Hardware Build" data object?

When attempting to release a "Hardware Build" a message appears saying that "Build should have an assigned part", see figure below:

From my understanding of Dassault strategy, As-Designed parts are no longer needed to be created as they are part of the legacy data modelling system. However, why Enovia still requests an "Assigned Part" prior to the release of the "Hardware Build"?

Or is the the legacy data modelling system still relevant?

Note: our 3DX version is R2022x HotFix 6