How is it more helpful for debugging compared to just looking at the git patch? As far as I can tell, this is meant to be more of a cool presentation type thing, rather than something to assist with development

Yeah, sounds like something I'd use along with Gource for presentations - gource is great for "show off our progress in the last year" in a Very Visual way (without actually being all that useful, but sometimes you need some non-technical visualizations.)

Pretty graphics and visualizations help people understand things because humans aren't LLMs. The web didn't have to evolve past having one font, black, on a white screen, but it did, because people aren't robots.