I don't think he is unique in that, Enya, Kate Bush, Mike Oldfield for example. But, I agree he wanted to get back to being a story teller, he still had to keep doing the guitar hero stuff at the start of his career because he didn't want to loose his audience, hence, his first few solo albums and tours were still guitar centered, but that has got less and less, the song is his voice now, where before it was the guitar and song.