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So what does immutable mean?

The easiest explanation is: You can't screw it up :)

That's the reason I use it. It means that the system areas are read-only, and as a user you can't "wreck" anything by mistake.

Try Bazzite:

https://bazzite.gg/

It will give you an experience that's familiar compared to the Steam Deck, and everything will "just work" out of the box.

It already has Steam installed and is a great desktop for general use.

To answer your other question, actively using and maintaining my PIM since 2009.

I like Silverbullet, but I could never get the file tree to work well. Any tips? Or is that not a feature you use?

I moved all my cloud computing from DO and Vultr to European owned options. It's a small thing, but it's about the only thing that I had been purchasing from the USA.

Sounds like someone who is sensibly voting with their dollar. I'm not from USA or Canada, and I am doing the same.

It's pretty identical there champ.

One of the benefits of Obsidian is that it stores its data in a format where you CAN use cli tools and python etc. That's one of the reasons I'm using it myself.

It's a different thing. What Obsidian and Logseq offer is plain-text markdown files in folders on your disk. Upnote and most of the other alternatives mentioned in this post store their data in a database.

Different thing altogether. Just depends what you're looking for.

You only have to consider the plugin developers. Most of them would have the technical ability to do what you mention, but they prefer to use Obsidian instead. Clearly there's a reason for that.