Because you already have to learn a bunch of new stuff, since Markdown does not support this use case. You could easily borrow some common things from Markdown

Because you already have to learn a bunch of new stuff, since Markdown does not support this use case. You could easily borrow some common things from Markdown to make things easier, but this seems to try to force following the Markdown syntax as much as possible, even when that syntax makes no sense in context. It is much better to invent new things for the cases that are completely new, than try to force a square peg into a round hole.