Fair warning: even by my standards, this is an area where I have strong opinions (I loved Usenet, and ran a Freenix-competitive full-feed site in the 1990s). I'll just leave this here:

https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...

I'm not saying I can refute what you're saying, just that I think my claim about "binary vs. plaintext" being problematic with respect to NNTP is well-founded.