> It is not features but structure and undetstanding that is missing.

I don't think this belief is valid. The whole purpose of markdown is to serve as a easy to read format that is publishable as plaintext and has minimalist standardized formatting and styling. It's something for humans to read and write without requiring specialized tooling.

For this purpose, "structure" is neither a requirement nor a valid concern.

> E.g. you may decide architecture diagrams are in Mermaid but that is by no means a stanfard and my org uses embeded svg.

That's a trait of your organization, not Markdown. Mermaid is ubiquitous, and used extensively in virtually everywhere in the internet. If you chose not use it that's a personal call you're making, and not related to Markdown at all.