"Mythology" ? There are always differing opinions and experiences especially with regard to High End audio. It appears to me reading comments from very credible and experienced members on this forum and say WBF that these additional parts/accessories used in streaming are in fact beneficial and improve sound quality.
There are very credible minds on both sides of this debate.
I don't want to turn this thread into that same old debate. However, I do believe that mentioning "the inherent noise in streaming" as though that is an incontrovertible fact and that these devices are necessary to correct them does a disservice to the less experienced wanting to get into streaming/digital music.
So I just think it's fair to note that there are other credible, non-fringe viewpoints, especially given the prices of some of this gear relative to more fundamental items that could be addressed with that budget.