It’s not hard to be true to the intent of the author of a feed, and create a good experience for the reader.
In the real world some feed items have titles and some don’t. Here’s a screen shot of my blog. I’ve put red arrows pointing to the items that don’t have titles. You could argue I suppose that they should have titles. That I should take a 9-word item and give it a two-word title. But I don’t do that. And it shows up in my feed without a title, because the item does not have a title. And that’s not up to anyone but me, the author of the feed.
Here’s a screen shot of how a popular feed reader displays those items. It isn’t terrible, but it’s imho wrong. The first item has a [no title] message where a title would go. Why? Look at it