Currently autoprobes are very environment unaware.
I was watching a creator friend of mine put together a tank in an area of my region that is high up in the sky and does not have probes set up. It was a flat area with not much around. I was surprised to see the reflections on the tank by default were not realistic at all with the bottom of the tank reflecting the sky as though there was no floor.
Rezzing a manual probe changed the lighting dramatically. It went from looking very wrong to normal.
I feel like this limitation with probes is going to stifle adoption of PBR in the long run as most people new to SL won't understand.
I'm aware that most game engines rely on creators placing manual probes, but SL is a unique place with unique problems. I think it would be good if at least research was conducted into the possibility of some environment awareness in the placement of autoprobes. For example by analysing the surrounding physics shape topography of a scene etc. I'm aware this could never be perfect, but I feel like it would be better than the situation we have now. This would help improve the success of PBR as a whole IMO.