We agree on many points. But you can say that in Sochi and after it, the system was maybe too oriented on the Base Value, contrary from Vancouver where was too oriented on GOEs. And they've changed the system again, for the way how it is today. ISU just want to find the perfect balance between the BV of the elements (how hard it is to do them) and the quality (the execution and the look) of them. And one system will be suitable to one skater, the different one will be better for another.
Personally i just see that in Sochi, TP needed glasses for some skaters.
Sotnikova scoring that high in the short program, getting the best TES, while she had the weakest layout of the top 6, shows how GOEs (and pcs) were more important than BV.
Usually quality wins over quantity/difficulty. At least that's what i see.
To come back to this topic, Yuna's win is unquestionable. It's just the gap that was too big imo. Mao made errors but even without the pop and the dowgrade the gap would have probably been 12-14 points. Which imo is too much for clean programs against clean programs and Mao having the highest overall BV.
Only a system with compulsory figures would have given a chance to a clean Mao.