Somehow reading up on pikchr has me ending up reading "Rebase Considered Harmful".
https://fossil-scm.org/home/doc/trunk/www/rebaseharm.md
But really, all I know is that at the office I use PlantUML and I don't like it. I don't know whether I like PikChr, but I like the mission statement:
"Pikchr generates diagrams for technical documentation written in Markdown or similar markup languages using an enduring language that is easy for humans to read and maintain using a generic text editor."
https://pikchr.org/home/doc/trunk/doc/purpose.md
The keyword is "enduring".