[phlakaton]

Mermaid's definitely not well-suited for the amount of text and text formatting that C4 requires. You can do it, but you will be jumping through hoops, and the autolayout breaks down pretty quickly when the arrows between boxes get chatty.

[gengstrand]

True but the big selling point for mermaid is the github integration and you can audit the changes to the diagrams via git log -p