What's your beef Old Joe?
D.Amos quantified measurements in a fashion never before seen, that apply universally to double guns.
You can compare any selection of shotguns using his measurements, and then immediately feel right in your hands what is different about them.
And he's gracious about it.
Some readers are able to shoot a wide variety of shotguns well, and some cannot. Some readers can implement theory into their lives, and some cannot or don't want to.
Some, with a little understanding, can see that a high MOI shotgun (or low) won't work for how they shoot.
None of this novel approach to measuring shotgun dynamics requires that D.Amos even own a shotgun, let alone shoot one.
Which makes the model even more valuable as well as elegant.