I guess it varies from one person’s experience to another but to me, flats & flat-darks are more important than darks especially with current BSI-based CMOS sensors.
CMOS are quite sensitive with much more manageable noise & minimal hot pixels that PixInsight can address more easily.
But flats/flat darks to me fixes things that is much harder to try to fix in post - not impossible but just a lot more effort.
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