We have privacy glass and manual dimming RVM.
I noticed, when driving two loan Macans with auto-dim for a week each, that I was still dazzled when in auto-dimmed mode. I found out the first was auto-dimmed when I reached up to dim the already auto-dimmed mirror. Both had privacy glass.
In other words... With privacy glass manual dim, when dimmed, gives a proper dim. Auto-dim doesn't dim sufficiently.
Auto-dim does dim the door mirrors. That's a plus or minus depending on your preference.
Just my take on it