Mo2vation:
If you want me to say it, I will without reservation: You are at greater risk diving with a diver who is shooting pictures than you are diving with a non photographing diver.
My turn to disagree with you, Ken. (I know, "..take a number.." :14: )
I've buddied with more than 60 different divers in 3 years of SoCal diving.
I often felt safer with the serious photographers because I could track them better.
I knew their primary goal was shooting pictures. As long as I paid attention, and tried to "see" the dive through their eyes, I could guess what kind of subjects they were looking for. I could look away and they were often right where I left them, their minds on the task at hand.
Most of my "suddenly solo" diving experiences were with non-photographers who had hared off after WhoKnowsWhat! And since I like rolling low and slow, this happened too often. Even buddies that I had done over 100 dives with would have erratic and unpredictable dives, lost in their own world, disconnected from any steadying goal such as photographing.
Nothing stays put like a dedicated photographer who cares about composition, precise focus, and best lighting. (Of course, I have been severely spoiled, thank you

)
I'll agree that a buddy who's shooting intently is
perhaps watching me less... depends on the situational awareness of the photographer. It takes more than free hands to make a good buddy. But I know, photogs may get target fixation and not look up for awhile.
That makes me more cautious to avoid entanglements or entrapments and stay within Glance-distance. If my gear fails, I'm likely to need to cover the entire distance to my buddy instead of being met half-way by someone who had noticed my predicament.
At greater risk just because my buddy is shooting? I don't think it's a rule.
I think it's the whole package of situational awareness that determines my buddy-related risk level. That's something any buddy should factor in when diving on a team.
'Dette