Operational Entity containment lost after transition to System Analysis

Hello, I am currently familiarizing myself with Capella and Arcadia and was wondering why the transition of Operational Entities is seemingly weird.

In OA actor/entity containment can be defined. After transition to SA these are represented as System Components, however, the containment hierarchy is flattened and no hierarchy information is retained.

Furthermore, there is no way to graphically (in other words, by editing or creating diagrams) add the lost hierarchical information manually. What bothers me is, that this information can be added in LA.

Why is containment information lost in SA just to manually add it in LA once again?

Thank you in advance for clearing up my problems understanding this design choice!
With best regards,
A. Zwenger