I bet money he'd have a similar problem with any widely adopted markdown replacement that was X Markdown. You may disagree. Note in his tweets he specifically

I bet money he'd have a similar problem with any widely adopted markdown replacement that was X Markdown. You may disagree. Note in his tweets he specifically calls out different syntax with the same name, but that feature is common to virtually all X Markdowns. Further, he has dumped the project and appears to be completely uninterested in fixing, enhancing, or otherwise having much to do with it besides twitter spats.