Exodus didn't take off exactly because it was ahead of its time. It didn't fit with what was played on the radio and was probably deemed unmarketable at that time, hence the no-promotion.
But calling This Is The One an "experimental" album is a bit too much. I don't even call Exodus or Ultra Blue experimental, it's just good pop with its own face. In the interviews she makes Exodus sound like it's a hard listen or something, but it's really not if your taste isn't deformed by charts. It's not Kate Bush's "The Dreaming", though in Utada's discography it'd probably take a similar place.