Thanks for including Creately in the list. flowchart.js sound really interesting. We have text to diagram ability for some of our diagram types like database and class diagrams. But flowcharts are widely used across many industries and rarely have a standard layout so we do not support it at the moment.
This is the main reason why we resort to hacks. Best practices, if understood, are more efficient than hacks. Developers must always search the best practice to solve a problem. Otherwise, they might create other problems that they won’t be aware of.