Hey Bob and John. In response to Bobs last post: strand to strand interaction and so on up and down the wire comes down to the dielectric utilized and geometry. Dividing the signal into many fine gauge individually insulated wires drives self inductance down to insignificantly low levels and enables a design to push geometry and proximity to their full potential in diminishing capacitance and series inductance at the same time. With properly designed litz cables, capacitance, quality of capacitance, resistance, mutual inductance, self-inductance, phase accuracy, and microphonics are optimized.
This may apply to Bob or not, but, the notion of “impedance matching” within the speaker/amplifier combination/interactoin is important because, theoreticaly, we would rather not have a cable that becomes an unintended or unwanted liability to the crossover design in a loudspeaker, and especially not an additional stressor to the amplifier. However, with proper material selection, geometry and adequate aggregate gaugeing (and a little science), it is possible to formulate a cable (which I kinda have done)that has very low inductive properties and very low capacitive effects (loading).
As for skin effect (depth) it is important that gauge of conductors be finer (for round conductors) flatter and wider for foils and ribbons. As you stated, "it makes sense that as capacative reactance is also decreasing, so more charge is being stored" is actually becoming more a function of "catch and release" within the conductor/dielectric interaction. Better the dielectric properties and geometry, the "quicker the release" of stored energy. This is actually a problem for alot of designs that use excellent materials but a poor geometric configuration.
