Most comments addressed why it would be better than plantuml and mermaid. If you can add a feature to export the diagram as a GIF with animation to show the sequence, this would be a great feature IMHO.

Why I see animation as a vital feature:

- This would give clarity to both developers and product owners.

- When there is a new feature in the system, it will be easier to add change and export.

- Easily embed in README files.

- To my knowledge, this feature is not available in any diagram software.