Soul, in this context, attempts to encompass all of the characteristics of a well-evolved gun. You may feel that itś not the best term to use, but itś only one word being used to describe a concept. The word may not fully convey the concept, but the concept is sound.
At the risk of putting words into phinton81ś mouth, I suspect the concept he is describing is the functionality of guns that have evolved over centuries. For example, walnut is not the material of choice for stocks by coincidence. It earned this nearly exclusive role by virtue of itś strength while remaining flexible, itś ability to resist cracking, and the fact that you can bend it and refinish it when required.
Synthetic stocks lack the flexibility and the feel of walnut. Itś like comparing a ##### to a dildo. Sure a dildo can achieve the required rigidity; sure itś the right shape; and to your point - itś totally functional. But, itś clearly not the same. You can´t adjust the cast on a synthetic stock, except with shims - again, not the same result. You can paint over a synthetic stock, but you can´t refinish it to original condition.
Equally, balance is not a uni-directional process. In other words, you don´t get a balanced gun by adding 12 ounces to the buttplate area. Guns are lifted, lowered, swung, and twisted in all directions when used. Properly balanced, a gun feels almost weightless in the shooterś hands.
Function consists of much more than the obvious characteristics. Us ¨Fudds¨, as those whose sensibilities are too coarse to discern the subtleties like to call us, have experience to guide our choices (keep calling us fudds, BTW, itś a compliment). Iḿ not surprised in the least that less experienced shotgunners see no downside to synthetic. Nor am I surprised at the attraction to bling (graphics, futuristic shapes and shiny crap). Young people always think new is better. We were the same way.