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Dithering will improve image quality, particularly with older DSLRs. The imperfections of equipment that limit imaging time because guiding becomes limiting are very likely those that make dithering necessary in the first place.
The argument against dithering is often confused by reference to dark noise, hot pixels and so on. Dithering does a whole lot more. The argument seems to originate from a desire to avoid dark frames, where dithering should only cater for the imperfections inherent in the image reduction process.
From experience, dithering will not necessarily remove or hide hot pixels, unless they are first reduced by image calibration. Image flatness is the beauty of dithering. But dithering is not always explained well. The focus around dark noise has relevance but misses the point.
Edit: same target same equipment - dither no dither Canon 1000D circa 2012.
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