Excalidraw has a 1 click 'sloppiness' change. We do drafts and ideation in 'full sloppy' mode, to indicate to the reader that this is not fully thought through, or a final documented decision. Once we've gotten through discussions and analysis, the final diagram is changed to be 'not sloppy', and the font changed from handwriting to a san serif font.

It's pretty effective to immediately communicate to folks that 'this is a concept' approach. Too many people instantly jump to conclusions about diagrams - if it's written down it must be done / fixed / formal.