It looks a little grainy / too much sharpening to my eye. Natural images tend have more blended features instead of looking like sand.
I'm not saying that stars aren't pinpoints or sometimes are just single pixles, but just it overall looks like some post-sharpening has definitely been applied aggressively to my eye.
This is also a much smaller area of the sky. The higher acuity of the image might actually be more representative of what the telescope actually sees. The smooth darkness you are used to seeing might be similar to how some people prefer music where the treble rolls off (like tube amps or sennheizer 650s headphones) vs people preferring a more linear freq response.
Also, in the case of this specific image, I think it's important to note just how deep the images are - they're processed for high resolution in the individual components, so the mosaic has an absolutely huge resolution. When downscaled to look at the whole thing zoomed out, that might give some of the impression of over-sharpness.
Peace!