Any topic is good. Don’t care about format or where it’s published as long as I can access it (substack, random PDF, journal, etc). Looking for deep and rare thought, but essay length for a short reading.
EDIT: Also I am particularly looking for stuff not as much in online or nerd culture.
Stanislav Lem wrote really good short stories next to his amazing books.
In my opinion he is the most philosophical, most intelligent and best in physics among all sciencefiction authors. I think his most famous book is Solaris but everything I read of him was actually really interesting - including the short stories.
Be aware that stories of his early career are more funny while later he got really pessimistic about humans in general.
I had one of his books of short stories when I was a teen (The Cyberiad) and loved it…meaning to read more of his work