@mswale
I feel it’s important I clarify what I mean by “decoupling” with regards to hifi music streaming. For Standard data networks or WiFi, this does not matter.
I view the chain of devices + cabling that run from outside your home to your Dac as typically connected via a copper wire (especially shield cable). That wire carries data packets AND some amount of electrical line noise derived from EMI/ RFI and/ or noisy devices. Decoupling, to me, simply means breaking the copper wire transmission connection of electrical “noise” carried from device to device. This is when galvanic separation/ fiber optic comes into play. Let be clear, electrical noise is not imbedded in the data packets, it’s the potential hum or ground loop electrically charged through the copper wire.
The less noise or electrical hash that enters your DAC the better. Less noise contributes to darker background/ lower noise floor.
I hope this helps.