+++ Most electronics is designed to be insensitive to these small variations in typical wire parameters +++
True. And most folks buy those electronics from Best Buy and K Mart i.e. most (audio) electronics are so bad that I wouldnt want to actually hear them ... ever.
Audiophiles listen to very specialized equipment that portray even the lowest level of detail in music. These very low level signals are not immune to cable reactance. Inductance and capacitance will attenuate said detail. Not only does it attenuate detail, it causes phase anomalies also.
Ditto for lack of shielding. Airborne electrical interference destroys the lowest level details.
This is obviously not a problem if said signals are absent from the source, like if you feed your system with a el cheapo $200 CD player for example. With such a system the boom-boom-boom still comes through regardless of cabling, and you will have zero low level detail no matter what cabling you employ.
+++ Surely this would make wire so crucial that equipment manufacturers would publish formulas or guidelines for calculating the correct length and type cable necessary for each type of component being connected +++
Some manufacturers (Krell for example) make use of proprietary cabling for just this reason. Others, like Coincident, actually sell cables to use with their products. They most certainly recommend that you use their cables for optimal performance. Cable companies like Goertz make different cable models depending what length of run you need. I believe Cardas NR is also recommended for long runs?
Having built a number of kit amps, the vendors have w/o exception always recommended which hookup wire yield the best results. The effect of component quality in amp building is beyond reproach.
After a number of years of building I can tell you outright that I can clearly hear the difference when I wire my amps with stranded (non litz) copper vs. litz or solid core copper. Its as clear as day. That said, my front end is somewhat more capable than a cheap CD player.
+++ The absence of strict well accepted guidelines suggests that either A
& B
+++
There is no absence of guidelines as you state, and your two options hardly corner the market.
Many manufacturers (for example Manley) suggest that you use aftermarket cables (just read their manuals) but for a number of reasons refrain from picking a particular brand.
Regards
Paul