rtureck seems to ask youtubo whether Yuna is beatable or unbeatable but this is my two cents.
Yuna was/is beatable and will be beatable if she continues to compete. However, in a way, she has been quite in the realm of (rhetorically) 'unbeatable,' at least, since 2009. Though she did not win at worlds, if she continues, everyone will consider her as a gold threat not just a podium threat.
The 'unbeatable' reminds me of Federer in 2005~2006. That doesn't mean he never lost during that time - conversely, he had never won the French Open until last year - but he was just invincible, formidable back then. Now he is still great but I don't think he has the same unbeatable image. I think Witt also had her own share of the unbeatable image/status for certain years. Among the current competitors, Yuna is the closest to that.
Since Yuna's senior debut, her record at the international competitions has been overwhelming and since 2009 more dominant. No doubt about it.
SP winning rate 71% (20/28)
LP winning rate 71% (20/28)
Total winning rate 71% (20/28) (the 2nd 5 times, the 3rd 3 times)
This rate is comparable to Witt - little bit lower than her, I think - and she is the only figure skater in history who has never been off the podium.
After seeing her SP at worlds 2010, I thought she might end in the 4th or below. The SP was probably one of the worst performances of her whole career. Well, her LP was much better but not so stellar as what she had done before. If other skaters had done better, they might have put her off the podium. Mao deservedly won but 2010 Worlds verified this. If other skaters were to beat Yuna, they should clean AND wait for Yuna's several mistakes. If they makes a few mistakes or gets DGs, they should wait for Yuna's SEVERE mistakes.
This LP may be Yuna's last competitive performance. Hopefully, it may not. Even though she continues, this 'rhetorically unbeatable' status will change someday. When and how the day comes is not known yet.