I really don't like overloading ```X as a way to render the output of running the code, because now you have no way to display a block of raw mermaid or math code which is the whole point of ``` in the first place. I would be much happier if they introduced a syntax variation to enable this feature more generally instead of overloading the purpose of backticks, something like ```!X (```!math or ```!mermaid) for "run the contents as X and render the output in the document".