If it's purely an engineering challenge why bother designing yet another DAC?

It's not "better" though is it, just different, for different preferences for different people in different moods listening to different music to sell different DACs

I disagree. There are some things that are 'better' to 90% of listeners. Often its more accurate than one can do with measurements.

Of course, some people are not methodical listeners. Not my problem if you can't figure out who to trust.

My problem is I can't tell how something sounds from measurements alone. If you had a few dacs to compare that measure about the same, you would see what I mean. But, you don't. Sorry, can't help you there.