Both links are sound engineering, albeit both based in the analogue domain.

I'm not doubting these things exist and can be shown to affect the signal, it's just the differences would be so minimal in the digital channel and it's carrier (speakerlink cable) to make it insignificant in the larger picture.

If we were talking a valve based moving coil phono cartridge amplifier, microphonics and EMF/RFI noise are extremely relevant, in a digital cable, not really an issue.