@Atlas Star I am calm and im just discussing :)
I'm telling you to calm down not because of the tone of your text, but rather the persistence in your endeavour for the absolute reason as to why KEIKO opted out of performing in this one particular live performance XD. You literally spent a whole PAGE of this 5-page thread going back and forth with the Reaper of the Seasons and Hatou when they have repeatedly responded with appropriate reasoning as to what the situation MAY BE ;)
Let me break it down for you:
You believe that YK Vol. 13 is not much of a burden on her voice
COMPARED TO a Kalafina live performance, since the former requires less stress on her voice than the latter. You think that if she's going to be performing at
more strenuous Kalafina lives, she might as well participate in a
less strenuous YK live. You cannot identify the reason as to why she even bothers canceling a
less strenuous YK 13 live when she's going to continue performing at more
strenuous Kalafina lives. XD
To which Hatou responded "she is prioritizing her Kalafina lives over her YK live." (paraphrased)
You CONTINUE TO PERSIST with the discussion afterwards, still stubborn on the fact that YK Vol. 13 has "such little songs that it will not be of a burden to her compared to a full Kalafina setlist" (paraphrased).
You need to realise that she is an adult and a professional singer and she can make her own decisions about what is best for her voice. You're seeking a "reason" that no one can find but KEIKO herself, and your criticism of KEIKO's choice is quite demeaning, to be honest. Sure, she should be resting this whole time to recover from mild bronchitis. Let's just cancel all the live performances they have lined up!
so yes. calm down :)