I don't think I got to use Sun and stars in my playthrough but I became so dependent on Gourmet that at some point I removed the skill just to give me a challenge.
As mentioned by ChevyNoel, there's certainly no shortage of food in this game. But at the very beginning in White Orchard I didn't know it so, just to be sure, I started hunting rabbits instead of talking to Vesemir, just to make sure I'd have some emergency reserves. :D