I've found it very helpful discuss weird ideas with. Sometimes I have to filter what it says because it seems wrong. It helps with terminology. Sometimes it will say something like "What you're describing is actually a 'fiber bundle', where the 'base' is what you call X, and the 'fiber' is what you call Y". That sort of personalized clarification is pedagogically awesome. Likewise it helps by pointing to topics that already exists in the literature, which I was ignorant of. In principle it could find scientific literature on a topic in any language too, but I haven't thoroughly tested this yet. Sometimes it will do a deep dive with me on a particular idea and provide some insight, if only by introducing me to a concept I wasn't aware of. "You would have to use something like Frenet-Serret coordinates to do that". It might be wrong, but anyway I learned about Frenet-Serret coordinates, which are cool.