John it’s advice that many disagree with, and i was not saying it’s wrong (and still not) but many users on this site stream from their Nucs (both as Roon Core and Roon Bridge’s) and swear by it. I started that way before utilising one of my Pi’s that I had In the house as Roon is a journey for most of us.
After adding an Audioquest Jitterbug and buying a good Audioquest cinnamon cable there really was very little difference to my ears between the audio that came from my headphone amp at the time., Now my equipment at the time was not what it is now, so maybe that makes a difference, but both options are available.
I was also running my Roon Core in my living room as well at the time and have since moved it to my study.
So Roon give advice which is the aim for perfection but there is no problem playing with this and see what works for you in your situation, because as long as it works and you are happy with it there are no issues.
Hopefully that makes sense