Scrolls allowed in ToH may cause more problems for the High Priest than one imagines... Namin? foresees some deadly usages of frost diver scrolls and wind weapon spiral pierce and the likes of such combo. In the end, it may end up even harder for the priests...
Just have to consider what do other classes get as a benefit too if scrolls are allowed. What the other classes get as a benefit may be even greater than the priests' benefits, which end up not solving the problem... Have to think carefully on that one~