@saramg i was thinking about this the other day. I remember we always let the players make their own rolls for things like searches and translations etc. But older me kinda feels like the DM rolling preserves the mystery feeling. It also gives me the chance to preserve a challenge that the players should work through without some blind luck ruining it. The players knowing they rolled a critical robs them of the experience. Clearly subject to abuse and misuse, but still.