The only "pros" are they don't rust.

For interior sheet metal trim screws, stainless looks nice and shinny. Good choice.

The cons are galling (dissimilar metal problems), price, unnecessary.

Use Gr 5 hardware. The strength of Gr 5 is equal or greater than the SS hardware that vendors sell. Gr 5 used in our trucks won't rust for 50+ years.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn