BookBarbarian
Expert Long Rester
I agree with the OP, but find it's not much of an issue if the Players are describing what they're character is doing, and what they are trying to accomplice before I call for a check and assign a DC.
So, using your example, if a Player said their character was going to start a fire in in the rain by finding a piece of fatwood rather than set an impossibly high DC, I might call for a Nature or Survival check for finding the piece of fatwood and starting the fire. On a success they start the fire and are fine, on a failure they start the fire, but it took so long that the party members incurred a level of exhaustion. If they describer there approach well they might get situational advantage. If they describe it really well, they might succeed with no check at all.
This way I don't need to use my expertise to set DCs completely arbitrarily, but can leverage my players expertise to set them somewhat arbitrarily.
Yes, this does encourage a type of metagaming. No, I don't care about that.
So, using your example, if a Player said their character was going to start a fire in in the rain by finding a piece of fatwood rather than set an impossibly high DC, I might call for a Nature or Survival check for finding the piece of fatwood and starting the fire. On a success they start the fire and are fine, on a failure they start the fire, but it took so long that the party members incurred a level of exhaustion. If they describer there approach well they might get situational advantage. If they describe it really well, they might succeed with no check at all.
This way I don't need to use my expertise to set DCs completely arbitrarily, but can leverage my players expertise to set them somewhat arbitrarily.
Yes, this does encourage a type of metagaming. No, I don't care about that.