For your weirdest claim:

> syndication noun

> syn·di·ca·tion

> the act of selling something (such as a newspaper column or television series) for publication or broadcast to multiple newspapers, periodicals, websites, stations, etc.

>> the syndication of news articles and video footage

( https://www.merriam-webster.com/dictionary/syndication )

The "syndication" in RSS refers to distributing the same content to many different readers.

Here's MDN: https://devdoc.net/web/developer.mozilla.org/en-US/docs/RSS/...

> This article provides a simple guide to using RSS to syndicate Web content.

Note that this is a guide to creating an RSS feed from the publisher's perspective. It is not possible for two feeds to be displayed together, or at all, on the publisher's end. How do you interpret the verb syndicate?

Traditional print syndication provides articles to smaller publications, who re-contextualize them in other material. Like your RSS reader does.

I note that you haven’t addressed your weirdest claim — that the default presentation of most feed readers isn’t.

> I note that you haven’t addressed your weirdest claim — that the default presentation of most feed readers isn’t.

As far as I can tell, you're making up non-facts.