So the bar is set pretty low?
More or less any sensible electrical properties, decent connectors and shielding, copper will do
Anything over and above is unjustifiable, electrically speaking?
Exactly...
To illustrate: a cable with 1nF capacitance (say 5 to 10 meters shielded wire) is connected to a source of 1kOhm (which is much higher than usual) will give a -3dB roll-off at 160kHz (-0.5dB around 50kHz)
A normal say 1.5 meter interconnect (say 200pF) connected to a CDP or DAC for instance with a 100 Ohm output R will give 8MHz as a -3dB point.
When the output R is 100 Ohm or lower even 10nF is not really problematic with a 160kHz cut-off point.
So cable capacitances even up to 1nF are not really an issue for interlinks.
An interconnect with a VERY poor resistance could be 10 Ohm (is kinda extreme). When your source is 100 Ohm and your load is 10kOhm the difference between a 10 Ohm and 0 Ohm cable would be smaller than 0.1dB.
Resistance is a non issue for interlinks.
Cable inductance: Say 1uH/m so a 10m cable is 10uH. The source resistance is 10kOhm (unusually high so worst case) = 160MHz
Non issue for audio at all.