Is Ayu getting better? Of course.
She's evolved than before, like every artist in the world (ehm..oh well most of them

).
I mean.. every album of her has a common factor: a theme. That makes her evolved as an artist, NEXT LEVEL for example is 'I'm more strong than before' even if her previous album GUILTY was 'I'm so sad, Nagase you ********'. She wants to talk about something, then she do it. That makes her pretty different from other pop artist that talks about i'msoosexyyou'resexytoo!Baawcomebackbabyhoneyohoho dancewithme EVERYTIME for over9000 albums. I do not talk as a fangirl but as a music lover.
Her voice maybe is worse than before, but that's all because of her disease, I think. I know she has a ear device but it's different from a human ear , guys. But in You were... her voice isn't so terrible so her voice is gettin better too

yay! (lol)
So I still enjoy her music, sometimes that sucks but who cares? She's still my favourite singer