I have been down this path and can offer my thoughts. Two years ago I started my digital journey with the BS node gen 3. After figuring out what I didn't know, the questions to ask and getting use to streaming with Tidal, Qobuz, etc., I took the next step. At that time I went with the BS node interface from PD Creative and an S Booster LPSU. I could definitely tell the difference in the sound stage, quality and detail. Again, at this stage it was all internal BS node plus the S Booster LPSU. From there I added an external DAC -Schitt Yggy LIM and heard a noticeable difference ( answering your original question as I continued to use the node for the streamer. Lastly, at least for now, I went big and invested in an Aurender N200 streamer and now the BS node resides on a second system. All in all I am glad I took the steps I did as the knowledge and experience was worth the initial investment in the LPSU/interface.
Bluesound Node130 LPS upgrade...
Was wondering if upgrading my BSNode with an aftermarket LPS improves the sound if I'm using an external DAC via usb-A to B cable, not bluesound's Dac? I understand the claims that an LPS audibly improves the noise floor, soundstage, etc, but is it while using the internal BS dac only? Appreciate your help!