Re computer vs. streamer, once you get an external DAC, the streamer (with built-in DAC) argument evaporates...IMHO, streamers are utterly overpriced for what they are, and you have to take the DAC that the manufacturer slaps in there. The whole "optimized OS for audio" is marketing hype, considering the minuscule computational power it takes to play/decode/transform audio signals compared to processor power in current computers.
This is absolute garbage advice by someone who clearly has no idea what they’re talking about. Listen to the others here (including me) who’ve transitioned from computers to a dedicated streamer and found a night and day difference. You’ve got your answer.