
With the taboo, in addition to it just being a pretty good "draw three cards", there are I think two investigators who might find its ability even more useful:
Both their weaknesses shuffle themselves back into your deck. Scroll of Secrets being able to discard weaknesses straight from your deck can give you a reasonable shot at getting rid of it for this run-through of your deck, especially if you only start using the scroll after you've just shuffled the weakness back in and your deck is starting to run thin.