What am I missing streaming music with a Node 2i

Looks like there are plenty of upgrades you can add at a later date.  Looks like a possibility for tinkering.

 The  MP-D2 MK3 10TH ANNIVERSARY ES9038PRO AK4497 AK4490 TUBE DAC

Afraid have to disagree with genesis.

adding a mytek Brooklyn to my vault 2 made a huge difference in sq.
not even close call.....
worth every penny imho 
i used the Brooklyn to perform the full MQA unfolding 

+1, uberwaltz. 

The DAC in the Node 2 is very good considering its price, but connecting the Node 2 to my Auralic Vega takes it to another level.  I already had the Vega before I got the Node 2, but I don't consider adding a better DAC to be a "waste". 

I'm planning to add a dedicated DAC to the Node 2 in my bedroom.  It's currently connected to my Oppo BDP-105D.  There's a noticeable improvement listening using the Oppo's DAC.  For convenience sake, I'd prefer to have a dedicated DAC.

I don't think adding a DAC to the Node 2 is a necessity either.  It's very listenable using the internal DAC and if the rest of your system isn't able to resolve the added detail, it might not make sense to add a DAC.