Michiru's talent reminds me of Uematsu's, who was, IMO, in his peak around FFVI, then during the PS1 FFs, he got overwhelmed by the hundreds of tracks Square wanted him to compose, and many would be lackluster arrangements of other songs(which he didn't do as much in the earlier games). He even admits that during that time, Square was pushing him to compose songs as fast as he could. He says that one of the perks about freelancing is that he's now able to take it at stride, and I think it was for the best. His Lost Odyssey OST is probably one of my favorites.
You can tell that Michiru did a lot of her creative stuff for Bloodlines and SotN, but what I think is that they(be it IGA or Konami altogether) got an idea of what they wanted from her and asked to "just make CV-ish music, nothing more, nothing less! Something classical with a modern beat.", which kinda limited her. There's more variety in her Bloodlines and SotN songs than in those following those two.