- permissionless integration

- no central control, even on the protocol

- production is my dev and test zone

Your list pretty much aligns with mine, though I'd probably swap out decentralization with one of those (though perhaps one could argue interoperability is a subset/consequence of decentralization). One thing I really like that I wouldn't include in any top 3 per se (but it's a real nice-to-have) is the ability to format a note more logically with a mix of images/media and text, meaning you can have text, then media, then more text, rinse & repeat. This is contrasted with in legacy platforms all images/media is forced to the bottom even if it doesn't make logical formatting sense in the context of a larger post.