Bit late to this party
But it strikes me if the OP is unhappy with the appliance route then Roon is not his product. Roon issue a fully functioning (apart from whatever bugs are identified) all in one package , creating an environment where the experience requires minimal IT knowledge. Plug and Play !!
The origins of Roon were a bit DIY with installing software etc but once Nucleus and ROCK came along the full appliance experience was there to allow take over. Their acquisition by a major hardware manufacturer must give some hints, the hardware route may be expanding not reducing.
I am a retired MS developer so I am perfectly capable of doing all the tricky Linux commands if I choose to, I choose not to.
Consider my personal situation , I am not expecting sympathy as it’s mostly self inflicted, 18 months ago and 18 years ago I underwent a neck fusion procedure to correct compacted discs . This has left my dexterity at not far off zero. Imagine choosing not to wear a conventional shirt because it’s too much effort to fasten the buttons. Typing is a bit hit and miss , while normal life is fine, fine motor control is all but gone. Quite simply my hands don’t work properly any more.
Enough of that , but the simple job of creating a NUC from the bits is now really beyond me, I bought mine from a local dealer and he put the bits in and tested it all I did was install ROCK.
The thought of optimizing etc I simply ignore, I had a library running under Windows that I transferred to ROCK and never looked back.
The point I am making is that not everybody is a budding programmer, not everybody wants to learn Linux ,not everyone has the skill set required to do such things. Some people just want to turn on a “Box” and listen (like it used to be ?). Did we hanker after optimizing the sound quality coming from your CD player back in the 80’s No of course we didn’t we chose the box that suited our tastes. I suppose there has always been DIY and tinkering
If that box was created by Roon, Cambridge Audio or Naim is irrelevant. I choose those 3 mainly because I have used all 3 and all 3 have a reasonable app interface. Roon has the metadata on top which reduces the screen time too, so to me wins out.
You pay the money you choose , if Roon has so many drawbacks why pay for it choose CA or someone else.
It’s like saying I hate Ford cars because the indicator stick is on the wrong side. The choice is in the purchase.
Finally a word of warning , both my neurosurgeons believe that the cause of my cervical damage was due to posture, screen position and TOO MUCH SCREEN TIME (my words)
For Ref my system is NUC 10i7 / 32gbRAM / 4Tb SSD to a Naim Uniti Atom HE , with various headphones