I think you need to do some comparisons on your own to get a sense of how much difference a new DAC or streamer might make.
Do you have a CD player? If so, the first step is to compare a CD with the Qobuz stream of the same version. Do this with a few of your favorite CDs. I'm streaming through my ASUS laptop into a PS Audio PerfectWave MK II DAC and I can tell you that the Qobuz stream sounds virtually identical to a CD played through the same DAC with my PS Audio transport. I wouldn't expect a stream to actually sound better than a CD so I'm comfortable that my streaming setup is giving me good SQ.
If you get the Schiit DAC it will be easy to compare the new DAC with the one built into the Node. Again, try it and see how much difference it makes. I'm going to bet that it will be hard to tell them apart but please report your results if you do this. Each time you upgrade use your CD player as a reference to see how much difference it really made. This is a great way to bring yourself back to earth when your confirmation bias is telling you that the several thousand dollars you just spent has brought the lusty audio fairies into your listening room.
I'm skeptical that most audiophiles can actually hear the difference between an expensive streamer and a Node if they participated in a blind test. The other thing to consider is that the Node has one of the best operating systems of any streamer available. Even though my laptop is doing fine as a streamer I'm going to get a Node for the file system and its ability to handle Roon.