I'm a product designer, and I've adopted Excalidraw as a daily tool in my workflow. It's wonderful for quick iterative exploration and collaboration with the rest of my team. Like another commenter mentioned, the messiness—or rather, variability—of the lines makes it much easier to focus on the ideas, concepts, and relationships over any level of refined design.<p>I've been doing this for more than 10 years and it's the first tool that achieves the same exploratory and collaborative outcomes as an actual whiteboard.<p>I'm a happy monthly contributor!