Comment by KarlVoit

One of the arguments of the article is that there is a fundamental difference: Markdown was created as a small subset of syntax elements. Therefore, there was a high demand on syntax extensions that were added in a chaotic fashion.

Orgdown already comes with more syntax elements that Markdown probably will ever get. So I do see a clear argument for the case that "unstandardized additions" to orgdown are less likely in addition to the fact that there aren't any.