Hans B. has several videos discussing digital signals and potential pitfalls. He makes a point frequently overlooked. Digital, 1s and 0s, are generated as an analog square wave. Timing stability is one of the important factors for any "Digital" device. I take his explanations to boil down to everything matters.
Quality of the source material is very important. From personal experience, the same track from Spotify and Amazon sound different. Tracks from either compared to CD passed through the same DAC do not sound the same. For me, a $500 streamer and $1K DAC is good enough to enjoy streamed music. Your mileage may vary.