Again, that's fine, I don't disagree. I just think that making rulings and sticking with them is part of that good faith, rather than a DM withholding an answer on "is a tree an object?" up until the moment a spell is cast on the tree seeking an object. If the tree is a creature for True Polymorph (meaning it can only be polymorphed into another creature of its CR null/0, and even then still won't have any mental ability scores and will just probably lie there in a coma), but an object for regular Polymorph (meaning it can't be polymorphed at all), that's an example of what's concerning about leaving this up in the air. Either ruling is "fine," but a good-faith DM should make a decision and not just leave the tree a quantum-creature-object-thing poised to frustrate whatever spell is cast on it at any given point in time.
Again, that's fine, I don't disagree. I just think that making rulings and sticking with them is part of that good faith, rather than a DM withholding an answer on "is a tree an object?" up until the moment a spell is cast on the tree seeking an object. If the tree is a creature for True Polymorph (meaning it can only be polymorphed into another creature of its CR null/0, and even then still won't have any mental ability scores and will just probably lie there in a coma), but an object for regular Polymorph (meaning it can't be polymorphed at all), that's an example of what's concerning about leaving this up in the air. Either ruling is "fine," but a good-faith DM should make a decision and not just leave the tree a quantum-creature-object-thing poised to frustrate whatever spell is cast on it at any given point in time.
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I'm going to make this way harder than it needs to be.