Why is it not reliable? The much famed "ordinary" user is often portrayed a bumbling incompetent user. For any heavy excel user, or rather any excel user thats

Why is it not reliable? The much famed "ordinary" user is often portrayed a bumbling incompetent user. For any heavy excel user, or rather any excel user thats ever used formulas, this is a common UI operation. Your CSV suggestion is good, but it can't carry the formatting and other extra info which is the reason people use excel to begin with!