I've got good results with white noise, not sure if that's something that would work for you. And of course I didn't suggest that this eliminates other distractions.
I was using Excalidraw for (maybe unconventional?) mind-mapping, and one feature that I learned to appreciate is the ability to introduce unstructured objects into the diagram (e.g. add a box grouping arbitrary links, drop an image etc). I wonder how Canvas will hold up for such use cases.
I've been doing mind mapping using excalidraw, but it lacked an easy way and visual way to link cards. This Canvas solution might simplify things a bit, though I wonder how much "freeform", unconstrained doodling I will be able to do using this. At the current point using simple excalidraw diagram might still be preferable.