If you are confused by a problem and don’t know how to solve it, you do not know how much remaining effort it will take to solve once you are unconfused, or what it will take to unconfuse yourself. You might as easily point out that “billions of humans have failed to do X over the least 50 years” for all X such that it hasn’t happened yet.
If you are confused by a problem and don’t know how to solve it, you do not know how much remaining effort it will take to solve once you are unconfused, or what it will take to unconfuse yourself. You might as easily point out that “billions of humans have failed to do X over the least 50 years” for all X such that it hasn’t happened yet.