@djones5
DACs are solved problems and have been for over 20 years.
My impression was that on a practical level the DAC problems were solved between 2007 and 2009. Several chips were introduced around that time, which made their way into professional studio gear I still encounter these days.
As to nowadays, more DAC distortions were introduced for audiophiles since then, to fight alleged "dry" and "analytical" sound typical of highly accurate DACs. One example is modern R2R DACs.
I'd say instead of using R2R and hybrid DACs, do what professionals do: if you are unhappy with a dry sound, just crank up your Culture Vulture, and enjoy "warm", "meaty", "weighty" distortions.
Those professionals who prefer mixing and mastering exclusively "in a box" - that is, inside a Digital Audio Workstation software - employ all kinds of distortion plugins, adding "meat" and "warmth" to sound. Worth trying too.