In reality, every answer provides (at most) one bit of information
Quibble: this is true in expectation but not in reality. Suppose we’re playing twenty questions, and my first question is, ‘Is it a giraffe?’ and you say yes. That’s a lot more than one bit of information! It’s just that in expectation those many bits are outweighed by the much larger number of cases where it isn’t a giraffe and I get much less than one bit of information from your ‘no’ answer.
Quibble: this is true in expectation but not in reality. Suppose we’re playing twenty questions, and my first question is, ‘Is it a giraffe?’ and you say yes. That’s a lot more than one bit of information! It’s just that in expectation those many bits are outweighed by the much larger number of cases where it isn’t a giraffe and I get much less than one bit of information from your ‘no’ answer.