Thats the entire point Iowa. Entire point. If we're not sure if we're +EV or -EV, particularly in places in which we might be + a little EV but - a lot of EV, folding is 0EV and is the better of the two options.

If we know we're +EV, we are always correct to make a call. Input any element of doubt as to whether we are or not, and the line gets significantly more blurry. In many of those cases you can find a better spot.