@jymc “why do so many people on these types of threads simply "root" for whatever DAC brand they already own?”
I suspect that pretty much regardless of your technique, experience level, financial means, or tastes, what you have is the culmination of your search and is the best to you. Which, of course, can mean a lot or nothing. So it makes sense you would have the best sounding DAC (given your circumstances) and would recommend it.
I bought my first DAC (a two box cd transport / DAC) around 1990. I used separate DACs for travel, my home system and my office system since that time. I have a good system and have had DACs of the $3.5K - $22K in my system. So, big surprise, I recommend my DAC provided you want a detailed natural sounding musical DAC. I will admit if you are a “detail trumps all” kind of guy or in a much lower price range I will recommend something else. But typically I try to comment when I believe I can add value.