Mimix atoms are based on the actual, typed text -- not the logical values, and changes to that text or its formatting are kept separate from the original text by virtue of the MSL, Mimix Stream Language, which is used to describe them. Although I hate RegEx, I can't see any compelling advantage in the Spor toolkit. In any case, I'm predisposed to use things that folks already know for simplicity and lowering barriers to entry.
There's a very short presentation about the method at https://doc-00-24-docs.googleusercontent.com/docs/securesc/d... (or https://drive.google.com/drive/folders/167z6GWl_mehmUdi6Qlkj... if those google docs download links aren't stable)