Sorry but for me it feels like a bug. I understand what you wrote, but why should I handle different levels? show both - the relative (calculated through VCA) and the absolute of the fader. But if you show only one, it is confusing when editing automation and looking on the fader.
If you take a real analog console with VCA - the VCA controlled fader would not move. and That is the problem with the automation.
So please, Presonus, introduce a new settings item:
Track/Bus/etc -faders controlled by VCA-faders do NOT move, when the VCA-Fader moves.