I have a feeling we are are at the stage where DAC’s can only be improved in functionality, connectivity and/or looks. When looking at the measurements of my Soncoz SGD1 over at ASR forum I don’t think I will ever need something else for a stereo setup.
My 2009 iMac (i5 first gen) runs Roon just fine and will continue to do so in the foreseeable future. The only problem is the power consumption… it’s an electronic heater 
Streamers could be another story…