For me, it's not even the value of the 3A that's the issue...it's the PCS. I don't understand how Yuna gets 8s and 9s in PCS and Mao and other skaters can't break past 7s. I don't think Yuna deserves lower PCS, I just think Mao and some of the other skaters deserve higher PCS.
Mao got an equal number of 8s. Both skaters got in the 7 range for transitions, but for the four other categories, they got scores in the 8-band. The only difference is within that band. There was about a 1 point difference separating Yu-na from Mao. PCS-wise, the difference wasn't as great as your post would suggest.
Also, Yu-na did not get a 9. She got six nines in her protocal, but in the end she emerged with none. Also, in calculating PCS for each category, the highest and lowest scores are omitted and the rest are divided for an average. Mao also got four 9s and the highest single score, a 9.50 for performance. The averages were in the 8s though. The shocking thing, for me at least, is that Joannie had no 9s.
I'll break it down for you:
Yu-na/ Mao
Skating skills: 8.60 / 8.25
Transitions: 7.90 / 7.40
Performance: 8.60 / 8.40
Choreography: 8.40 / 8.10
Interpretation: 8.75 / 8.20
PCS in total: 33.80 / 32.28
The 5-point difference between Mao and Yu-na really comes down to GOE. I know the 3A is impressive (if you look at my past posts, I wholeheartedly agree that it should be given a greater bv), but in line with CoP, Mao does not meet the GOE-garnering qualifications. By that, I'm referring to Ito-style jumping in terms of height and distance and Buttle-style jumping in terms of beautiful transitions. I'll try to find the listed qualities (the checkpoints)... I had it somewhere.
Hope this helped
Edit: OK I found it!
For 2/8, a skater gets +1 GOE
+2 GOE for 4 bullets
+3 GOE for 6 or more bullets
1) Unexpected/ creative/ difficult entry
2) Clear recognizable steps/ free skating movements immediately preceding element
3) Varied position in the air / delay in rotation
4) good height AND distance
5) good extension on landing / creative exit
6) good flow FROM entry TO exit including jump combinations / sequences
7) effortless throughout
8) element matched to the music structure
I think #2 doesn't count for the required element in the SP. I'm not sure.