Use Cases and Deployment Scope
The feature I use from Whimsical is the mind mapping mode.
I've tried many other mind mapping tools (e.g. Clickup) in the past including desktop apps like Freemind, but in terms of cloud-based mind mapping tools, their mind-mapping tool is the best one or the one I prefer using the most.
I use mind mapping to work out product development, doing brain dumps to organize thoughts and ideas.