If they had that rule, do you honestly think Yuna Kim with the most consistent difficult trip triples in history wouldn't have devised that strategy too? you really don't think she is capable of putting all her jumps at the back in the 2nd half in a SP, or do you think she chose not to because that is 'suppose' to harm PCS score for imbalanced poor choreography, but for some reason wasn't penalised here. Likewise, had Evegenia competed under the same rule, do you think her tripless = kim's triples in quality and execution regardless of the GOE standard of the day.
Mao had her chances, she did not deliver. If we could all have rules in our favour and talk about scores in theory, yeah Mao has could have everything she need to be best in the world, but that is not what happend. It is a competition. You still have to deliver when it counts.