I’m extremely satisfied with 80-90% of the standard Gitbook markdown flavor. Then every now and then I really wanna make a complicated table, or a code block highlighting few lines while maintaining syntax highlighting, or an interactive slider, or a formula calculator that’s built-in the documentation instead of a complicated function, or a particular graph/chart etc. I don’t know how something like mdx would work for a large team (ever tried to clone Microsoft’s doc repo?) but at least for my own stuff, it seems like a definite improvement.