4Seasons : In the Majesty Japan 2013, Ayu said that :
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"Up until now I always had certain time frames in which I had to release something. […] But I will no longer create music for the sake of a release date. I will collect songs that I like and once I've reached the stage of thinking 'this will become an album' I will create an album. […] I think the pace at which I live my life will change a lot."
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sorry I coudn't find the full translated interview. It's possible that's the reason why she didn't want to release single anymore (even if we had Feel the love/merry-go-round and zutto... singles since then but she surely created the songs and decided the release date as a single thereafter).