2 seconds can almost seem like forever
I hear that, underwater does that and so do certain situations underwater. “C’mon turn around and face me rock beauty, my group is really getting far away” 
But that said many factors go into what people need, for instance budget and travel considerations. Unfortunately for me, most of the time I got to go places via plane, so some of these things factor in a bit more (I am jealous, it looks like you can dive whenever you want in Florida )
I plan some road trips in the car to go diving, so everything is going, yes even the proverbial kitchen sink. But when flying, people usually prefer to carry their gear (at least I do) on board so they can shoot. If my clothes do not make it, I can always buy a t-shirt and shorts, if my camera and video gear do not make it, urgh.
And of course there are also budget issues. I know what I would recommend if unlimited budgets exist, totally maxed out high end Nikon or Canon camera, every lens and port, double arms with big strobes, plus someone to carry it. But again sometimes not practical to give that as advice.
And there are other consiiderations - for instance the Pentax camera has tested out with good shutter lag, but cycle times are slower. So any of the strobes will match up. Like I said earlier, if you are going to drop dime on the strobes, you may be able to get a dual rig for the same price, and if the choice is one DS-125 or 2 DS50/51s, based on factors also mentioned below, the DS50/51 combo can be alot better setup. The angle of coverage also should be adequate even with one strobe (not sure if the poster has a WA lens or not, or if one is available.) Some other considerations - does the person night dive alot? Dives cenotes or wrecks? Goes to places with alot of long swimthroughs? If so perhaps the spotting light feature of the DS-125 is worth more in that case, otherwise a simple SL-6 taped to the arm may do the trick. In fact all these things factor into what I take on a trip or on a particular day of diving for me.
Does the person have alot of dives under their belt? (If you are new to diving or multitasking underwater, sometimes a small camera/single small strobe may be easier to handle until you get buoyancy down, and the person may be able to get better results than trying to haandle a big rig.)
You have to remember you have unique experiences and special opportunities in what you are able to do (dive) and access to equipment based on your business and location (again jealous here :D ) but other people may not have the same things in their lives.
And obviously what I post also has my natural tendencies and thoughts based on my experiences and someone reading this can think I am off base, so I am not saying you are wrong in what you are saying so please do not take it that way.
But sometimes the best answer to questions can be a couple of more questions.
Peace
