Precautionary principle? I'm sorry to say stainless steel may leech heavy metals into food during cooking [1]
And also silicone may leech potentially harmful chemicals into food [2]
Nonstick coatings? Teflon flu "could be a real concern" [3]
Wooden spoons are porous and can crack, making them a breeding ground for germs, and they can splinter [4] - and good luck finding a wooden spatula that doesn't suck.
So personally I don't think it's churlish to take these warnings with a grain of salt. Especially for rarely-used pieces of cookware.
[1] https://pmc.ncbi.nlm.nih.gov/articles/PMC4284091/ [2] https://pubmed.ncbi.nlm.nih.gov/19680914/ [3] https://www.cnet.com/home/kitchen-and-household/teflon-flu-r... [4] https://www.express.co.uk/life-style/health/1941959/replace-...