Yeah, IMHO Obsidian is in a class of its own for markdown-based PKM / TFT / devnotes. And the Excalidraw plugin for Obsidian is absolutely phenomenal.

I've seen Excalidraw mentioned quite a few times, you've just given me a nudge to go check it out. Thanks for the plug.

Obsidian's "a vault is just a directory structure with markdown files" is the biggest reason I use it.

It works in Joplin too