The word ’always’ is often good to avoid, but from my experience, it ain’t necessarily so. I had an MSB ’Analog DAC’/volume control going directly into my MSB power amp and the sound was superb. I later got a Herron Audio tube preamp and put that in between the DAC and the power amp, and the sound improved considerably from that.
Yes, words such as “always”, “never “ and “best” are rarely applicable in audio topic discussions. Far too many variables exist to make those terms meaningful. I would just say that based on my listening and observations that a “high” quality preamplifier more often than not contributes to improved sound quality.
In a situation such as @willgolf’s I can see this as an exception to my generally speaking scenarios. The Lampizator Horizon exceeding the Pacific DAC is quite the accomplishment. Congratulations @willgolf .
Charles