I'm going to bet a nontrivial number of visually impaired folks are very interested in tools that provide better views of the night sky and in sites with detail

I'm going to bet a nontrivial number of visually impaired folks are very interested in tools that provide better views of the night sky and in sites with details about how to find and view celestial objects. You seem to be very lacking in imagination here. Anyway, it's not up to you to decide what they can or should be interested in, just because they experience the world differently than you do.