I think you may want to limit it to showing the most recent post from each blog? Otherwise, when someone fixes an RSS feed issue and dumps a whole bunch of posts, you get something like what is currently #17 through #36 on https://hn-blogs.kronis.dev/all-blogs.html , running from https://cjlm.ca/photos/may-14th-2024/ to https://cjlm.ca/photos/october-7th-2023/

It's probably also worth hiding all of the ones that say "No title found"?

Heh! All of the "no title found" posts are mine. I've recently read Manton Reece's book on microblogging and decided he was right: not everything needs a title. I could have come up with something relevant for https://honeypot.net/2024/06/07/since-ben-surtees.html or https://honeypot.net/2024/06/05/my-boss-was.html but it wouldn't have added to the information I was trying to communicate.

I'd recommend replacing an unset title with an abbreviation of the start of the content.

Too late! X platform now has micro blogging tools

ah, no way to avoid micro managing then. :-)