This assessment raises two issues. First, it is arbitrary. If 10 of the 15 CIs included the predicted values, would the results also support the theory, or instead refute it? If one instead used 99% CIs, would positive results for 12 of the 15 predictions be enough to support the theory? This arbitrariness arises because CIs offer no principled method for generating an inference regarding the theory.
Estimation is too messy / complex and not clear enough