You are right but it is not because the weakness of AI, it is because all AI generation app are built by those coder only know .md files. They do not know what a consultant level slides looks like.

See this demo in the middle I show some top level strategy business slides (they are all generated by AI) https://youtu.be/Sq3a5qxsLwM

I am also working on such tool :)

marp works fine IMO