The feed validator operated by the W3C is kind of frozen in time, and imho has a very odd perspective on things. But until ChatGPT et al came along, it's all we had. I had a thought that you could program a cool validator using ChatGPT, but then I thought, let's see what it comes up with if I ask it to play the role of a "feed consultant" in 2025.

i want you to pretend for a moment that you are playing the role of a 2025 feed consultant. i give you the url of an RSS 2.0 feed and you look for problems. OK?

I gave it the URL of my blog feed, https://scripting.com/rss.xml.

The result blew me away. The report, in Markdown, is in the first comment in the thread.