Gearing just gets you back what you loose when going with a bigger tire. With a 392 having so much TQ it will be less affected by a tire size change than the smaller motors.
I'm sure they selected 3.73 for a couple of reasons. They don't want to break axles and since it has so much TQ they can run 3.73 and keep the MPG up as much as possible, 4.10:1 applies more tq to the axle than a 3.73, 4.88.1 more than 4.10:1 and at some point things break from stress.
This is most likely one of the reasons they went with the 2.72:1 4 low, That and they wanted to use the 4 auto case so the power is spread across two axles and the average guy can keep these in a straight line. Remember these have factory warranty so I'm sure a lot of that plays into gear ratios.
I have twisted shafts on a JK 44 with the 3.8 "minivan" motor running 4:1 case with 4.88:1 gears. Its easier than one might think. I now run a Dana 60 on that one.