Armour All was even a name-brand example of silicone-based and I use that religiously. It was in fact stains, glues, paints and the like that would have a hard time being used. Guess it's "Vintage Worn" for my guitars.

Worth bringing up I figured, since it's probably a natural inclination to treat a wood guitar finish like any other piece of wood furniture. The things that make these products bad even make the guitar feel better to play (more slick), so I bet a lot of folks use them. It was certainly counter intuitive to me! :)

I wonder what the finishing and sealing properties of silicone would be? What if one embraced it and impregnated the wood with silicone instead of oil or water-based stains? Hmmmmm...