Indeed, there's always the risk of breaking a document, since we are dealing with raw edits to a Markdown/MDX/code file. This is very well described by the Ink & Switch team working on Peritext (https://www.inkandswitch.com/peritext), when it comes to WYSIWYG editor operations (bold, links, etc.). This is a more general issue of making semantically wise decisions in your merge strategy, and it's exacerbated in real-time collaborative settings (we sort of mitigate that in an asynchronous, Git-like workflow by reviewing commits / ensuring they compile before they are merged). We haven't dealt with this yet, but this will be really interesting, especially when it comes to merging code blocks.