If you're gluing to a bare board and bare
traces that may be true, but it's rare to
find a board that isn't conformal coated
nowadays.

Conventional RTV silicones outgas acetic acid for some period up to days - long after it is 'cured' for practical purposes. And that acetic acid will attack exposed metals of many types, including 304 and 316 stainless steel. And, worse, if that silicon is in a confined area such as an enclosed chassis, the damage could be inches away from the source.

Peter WIeck
Melrose Park, PA