Streamer vs. new mac mini for 2 channel system


Hi audio friends,

I LOVE the functionality of my mac mini with my 2 channel system: Exasound 62e DAC, Modwright ls100 pre, Coda continuum 8 power amp and Wilson Sabrina speakers.  Being able to navigate with mouse and keyboard from my listening position is infinitely better than using a tablet or some mickey mouse app with my phone.  

The issue is the mac mini.  Clearly this is not the best transport, however I want to use my 2 channel system for more than just streaming roon.  I listen to soundcloud a lot to learn about new music and when I watch tv I want to utilize the stereo for netflix, crave etc.  My Dac has only 1 usb in and obviously an optical + s/pdif, but the fidelity is just not as good with the other inputs.  

I almost pulled the trigger on a Lumin U1 mini, but again I do not see how this transport will improve fidelity, without limiting overall functionality.  How do I bring a new mac mini to a place where it can compete with a dedicated transport like the lumin, or is this even a reasonable suggestion?  

Looking to optimize the system in the most efficient way.
Confused - any suggestions would be much appreciated.

cshadow
I was streaming music via Tidal and Qobuz while using my MacBook Pro as my ROON Core. And when I told my hi-fi guy that he asked if I was crazy, or did I just enjoy listening to music whose sound was exceedingly poor. So I bought a ROON Nucleus Rev B, put a 2TB storage card in it, and got an Sbooster 19v LPS to power it. The sound quality is really quite good. Now I can pick up my iPad or iPhone and play music anywhere in my house. 
Lumin D2 user here. 
I’m a retiring IT consultant and hardware person. I have several notebooks around that could be used as a transport feeding a DAC. 
The D2 frees me from messing with a computer tied to my audio system, and the maintenance, updates, and configuration of same. 
I messed with 5 different streamers before I finally bought the D2. 
Pros:
One small box
Decent app (far from perfect)
Excellent sound quality - easily surpassing what can be stored in a digital file. Upsamples most anything to DSD
Plays most file formats (except for WMA)
Decent price point. 
Cons:
Requires some sort of UPNP server. I have a Synology NAS which has a basic UPNP server, and the free version of Lumin’s recommendation of MinimServer is available as a “package” from Synology. Takes some messing - especially with a few TB of poorly tagged and mixed file formats. 
As I have cleaned up my music library, I’ve gotten used to the shuffle: UPNP rescan, reload music library, check app for proper tagging, album art, etc. 

Pull the trigger! Open box prices are 10-15% below retail. 
@fuzztone, McGowan uses a Mac Mini until his long promised streamer comes to market.
@unsound.
That’s what I said, Apple. He stresses that the only thing that makes it tolerable is BitPerfect.

BTW I also retired my Synology, a pita.
I have relegated my Synology and QNAP nas boxes to backup duty.  Roon running on a Roon Nuc with ssd's now and a complete copy in Dropbox (although I'm teetering at the 2tb Dropbox limit and last I looked the next size up was a lot more per month as a 'business' account.)