A lot of the SQ you enjoy is due to system architecture and operating system optimisations. I think its unlikely Roon would venture into those fields, which seem very well handled by specialist programs.
Integration with HQ Player is much anticipated, but may not deliver the SQ you have experienced.
What sort of changes do you think Roon could make to improve SQ ? What is Audirvana doing right ?
Edit: I am using AO in minimal server mode. There were reports of users running RoonServer in AO optimised 2012r2 core mode, but as set out in this thread, I havent been able to replicate that. The barrier is reloading wsemp.exe after getting into core mode. If you are able to do that then you might hear an improvement to SQ and it would certainly be of interest to others.