Im new to the audiophile world and cant say i excell at science, so my opinions are based on the opinions of people who are smarter than me. My personal opinions about all dacs sounding basically the same go back and forth. One person says a dac is a dac the next says there is an obvious audible differance between the modi 2 uber and the modi multibit etc. For example. The multibit is out of my price range and $100 more than the modi 2 but an "obvious" increase in sound quality even to untrained ears, is nothing to scoff at. Adding to the confusion, are people being dishonest in order to sell you something. I am open to both schools of thought and will keep my ears open.
It's a bit contentious, mostly because of the never-ending "subjective/objective debate" that is fueled by those folks trying to sell you things (remember: there's real agendas here), but this is a panel discussion on various "audio myths" that's stacked entirely with legitimate experts (as in, people who work in academia and at research labs, with legitimate credentials and publications to their name):
https://www.youtube.com/watch?v=BYTlN6wjcvQ
Beyond that, it doesn't require a degree in rocket surgery or a $500,000 credit limit to dissect this stuff - its well understood/accepted that after a given point of measurable/technical performance you've exceeded the limits of human audition (that is, sure a scope or a meter may tell you "its better" but our ears can't tell the difference), and modern DACs more or less all reach that benchmark in terms of frequency response, dynamic range, noise, etc. Of course you'll run into people making wild claims, and there's all sorts of issues not only with marketers cooking up "new problems that their great new product solves!" but also with "consumers shilling consumers" where folks go out and spend a lot of money, expect to hear some big, night and day difference, and then surprise surprise, DO hear some big night and day difference that 100% confirms their expectations, and who get quite defensive/cagey when questioned about it or asked to assess it critically.
Of course you can dismiss all of this and say "well that's just like, your opinion man" which has become, unfortunately, an all too-common tactic in the modern world as a means of shutting out competing viewpoints and remaining within our own isolated info-bubbles, and audiophile marketing is probably one of the earliest examples of this in practice.