I don't get the argument at all. If someone is so averse to publishing a feed of full article text, they can still publish a feed of headlines, first paragraphs, and "read more." It's tedious to read those but much better than no feed.
I actually like it when feeds have some sort of TLDR in their feed body. It works as a quick way to determine if I want to read the article or can skip it.
Fowler's blog does this (or maybe Feedly does?) but not many others, afaik
Now that I think of it: that would a very nice use of an LLM: some proxy where I put an RSS into, and that publishes a modified RSS feed where the <description> is then replaced with a very short summary of the original description.