I am ambivalent about the Speak with Dead amulet. I like do have that one at the very beginning. If I would find it in act 2 and use it, I would ask myself all the time, what kind of reactions / information would there be in act 1. Or why do I have to rest so often again to use the spell (also clashes with the short rest / long rest problem).
On the other hand, I would then no longer have to worry about watching out for NPCs so that I don't accidentally finish them off with elemental spells, because Speak with Dead would then no longer be applicable, and I would also have to translate / read less dialogue.