I love that so many people are building with markdown !
But also would like to understand how markdown helps in durability - if I understand correctly markdown has a edge over other formats for LLMs.
Also I too am building something similar on markdown which versions with git but for a completely different use case : https://voiden.md/
I read the durability thing as markdown files are very open, easy to find software for, simple and are widely used. All of this together almost guarantees that they will he viewable/usable in the far future.
So markdown will be great for distribution in the future.