Novice Question: Dedicated Streamers

The Bluesound Vault is just that, a way to store your music, and then play it.
The Node is just a way to stream music, be it from a streaming service or from you computer. With multiple units, it can also connect with each other so you can listen in different rooms.
All the iterations of the Nodes are pretty much the same. Only the newest one will allow you to use the 5ghz wifi band. I own the original Node and added a Netgear wireless router to use the 5ghz band.
The nice thing with Bluesound is that you can use an outboard DAC. 
The one that comes with the Node isn't bad, but upgrading to, say, an Ayre Codex or a Schiit Gungnir or Yggrisil will get you pretty far in the Digital streaming mode.
I never thought of using digital streaming, but once I found Spotify, Tidal and Quobuz, I haven't cracked a CD case for 4 years.
Bob

I haven’t cracked open a cd case in over 10 years, unless it was to rip it to a hard drive. I had a $3000 CD player from Classe back then and sold it. Back then, a Mac running pure music or amarra was the ticket. Then Audirvana came out. Went the dedicated music server route for a couple of years sharing a large multi TB disk system from a computer and got rid of that because it was still using the flawed USB interface. Now, back to using a computer running Roon server and using a hard wired CAT7 cabling network to interface with my dac with a network bridge card.
if you want to buy a dedicated music server, you are still buying a computer, probably using Linux, which is a great OS but most audiophiles or local technicians have no idea how to work on it. 

Like Lg1 I am somewhat confused about the benefits of a music streamer. What for example is the difference say between a non storage streamer and a Bluetooth receiver such as a Bludento BLT-HD or an Auris bluMe HD? 

Check  out the Music Vault by Sound Science.  You guys are missing the boat

Thanks all and definitely appreciate your inquiry, Mazian as I suppose my confusion about these components may have similarities...  Right now, I’ve got iTunes on my Mac playing 16 bit AIFF ripped from CDs going wirelessly to an Apple Express which goes straight into my integrated amp with no further DAC presence.  While the original question I posted about Streamers without onboard storage has been cleared up somewhat in my mind, I keep wondering what I’d gain by acquiring one of them up and above what I’ve got in terms of functionality (I assume the SQ stands to be possibly be improved significantly? or not?). I suppose a solution like the Vault, with its onboard storage, would save wear and tear on the Mac but to a cost effective degree??  Perhaps the Node 2i plus a TB external drive with a copy of my iTunes collection might be more cost effective in that regard?  Intriguing to ponder, for sure...