In the recent StarTalk interview, she expressed that she didn't like to have direction in her music as she felt it impacted upon her creativity (or something along those lines).
I remember the first time I listened to SURREAL and read a translation. I was completely floored, I couldn't get over the degree to which I could relate to her, and while other songs have a similar effect (Last minute is a recent example), they just don't go above and beyond, they're not complex in their nature. Ayu had a master ability to describe and explain her own life, whilst also shrouding it in enough mystery and abstraction to allow others to relate. Her internal conflict has manifested differently nowadays, and I think may have stagnated? She seems quite stuck on love, as opposed to her past self, who while also wrote extensively about love, also divulged into social issues as others noted.
I think we are seeing changes with Ayu at the moment though, from the TA Tour, to making amends with her fanbase, to quitting Twitter, to firing Alvin Goh, etc. Perhaps we'll see larger changes this year.
No matter what, however, I'll be always interested in listening to an Ayu album hahaha.