don't worry, you are not blind. i don't see it at all either. maybe ppl here are seeing yuna's "soft" skating as hunched over. but i don't think so at all.
i much prefer her soft leans to the music etc to the overly stiff mao (no matter what type of music she is skating to, mao always seems stiff.) now, if this means "balletic poise and good skating posture" give me hunched over yuna anyday. in my opinion, yuna has one of the most beautiful postures while skating of today's ladies.
(although, i don't like her ending pose of miss saigon very much. wish they would change that, david wilson!!)
I definitely think that Yuna DID have a habit of hunching in her junior days.
I wouldn't necessarily notice it during her programs, but AFTER them, she would kind of hunch over and bow real quickly as if she couldn't wait to get off the rink sooner.
Nowadays, not so much.
I think confidence might have something to do with it as well as good coaching.
As for Mao, she has a beautiful posture, but she does look stuck in it.
There is no variation whatever music she is skating to, and to me that comes off as lack of musical interpretation.