Because recommendations will vary by not only currently accepted practices, but also geographical variances in product availability. It's better to look at what you have on hand and cross-reference with up-to-date information.

Much like most people won't simply know how dangerous it is to mix Nitrile gloves and Nitric Acid. When things can melt your skin, it's always good form to verify safety info at the time rather than just taking somebody's word for it, no?

My 2 cents that is probably obvious anyhow