I've seen her twice in live and her vocals were amazing.
I really don't think her voice is always edited and autotuned. I've studied a bit of sound design and when you use too much filters on a voice, it's getting almost robotic (Cher for example... Or worse, Madonna when she tries to sing live). .
And sometimes, you just can't sing right. It happens.
I also think that Ayu re-recorded her vocals for the CDL 2015-2016 and that's why it took so long to come out on DVD. The best example is "Many Classic Moments". They couldn't edit her vocals that well. It would have sound robotic.
But that's a theory. I'm maybe wrong.
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