Sure, and you could hand-write your blog posts in a hex editor so that the binary data can just be pumped out over the wire. Markdown generates HTML. MDX genera

Sure, and you could hand-write your blog posts in a hex editor so that the binary data can just be pumped out over the wire. Markdown generates HTML. MDX generates HTML. Use the tool that brings you joy and makes your life easy. In any case, the point is that referencing another piece of code from your markup can be done in a number of ways, and the way the author chose has an upside but also a significant downside.