Maybe that's why I have no problem with them - memorability is not a criterion that I think determines the overall quality of a soundtrack
Also, as to the lack of subtlety, Formy - really?
And I really don't get why you think the Estersand doesn't fit - it's your first location, a place of hope and adventure, with lots of happy cactoids running around. I think it's a perfect, majestic piece that is an integral part of this huge landscape.
The cool thing about FFXII's field tracks that was probably also their most challenging aspects was that, by design, they were meant to fit both exploration and battles to help facilitate that seamless experience. If you ask me, Sakimoti did a phenomenal job because I don't think there's a single field track that doesn't lend itself well to both.
Yeah, like Galuf said, FFXII's OST is criminally underrated.