GASP 5.7 Sandbox Blueprints do not inherit Base Bluprints ?

Hi,
Is there a reason why the Sandbox Blueprints (Mover / ABP) do not inherit Base blueprints in the sample ?

Are the “base” blueprints to be discarded in the future ? Are they planned to be used for non-player actors ?

I’m customizing behaviors and I’m changing “Sandbox” blueprints only, as they are the one used for the spawned player.

Also worth noting that CMC Blueprints do not seem to have a “Base” variant hence avoiding this ambiguity.