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I've embraced radical simplicity with Obsidian.

I have an inbox folder that is where all new docs go. Then daily notes. That's it. I tag lines with #thething #theotherthing.

Tagging acts as the organization, lowers the barrier of entry and keeps things discoverable.

Indented lines don't inherit tags, right?

I use logseq but Obsidian seems way more widespread, but I am struggling to give up tag inheritance

No but that seems like a read-query/time concern that can be solved rather than your data.