I suppose we all follow a different path on our journey to audio quality.
The only isolation I use in my current system except for rubber feet on various components are paving blocks I purchased at the local Home Depot, i use them under my speakers. I think the cost was 0.89 each.
I used a laptop as source into a Schiit DAC for quite some time, but the idea to remove the laptop from the equation seemed to be the best step I could take on this journey.
I wanted a streamer, but couldn't afford the one I wanted, decided to go the raspberry pi route. I now have a raspberry pi 4gig with rune audio (not related to roon), a 1TB ssd storing flacs and it is connected to my Denafrips DAC via a decent USB cable, then the next step in my system is a passive XLR preamp then XLR into Bryston mono amps. then onto Von Schweikert speakers. this cobbled up system is near audio heaven for my ears, I don't see myself changing anything any time soon. Well, except perhaps selling a cd transport I have not turned on for almost a year.