So in essence, "Calm" is the ideal scenario for flying a navigation.
Personally I prefer a stonking but steady tailwind on all my legs, and a moderate non-gusting headwind just down the runway for my take-offs and landings. And the last remains of a cold front just moving away as I start my engine.
So far I have not flown in those conditions though. At least not on days where everything came together.
Furthermore, dead calm conditions, particularly this time of year, typically mean a lot of morning ground fog which burns off, or lifts, relatively slowly as there's not a lot of mixing in the atmosphere. Particularly as those dead-calm conditions often mean you're in the center of a low or high pressure area.