Well it was fully orchestrated, even used some traditional Japanese instruments, and Western instruments.I feel like the issue is that some people wanted a crazy fully orchestrated soundtrack to be playing at all times. And look, that can be fine in a game with smaller levels where you aren't wandering around the same bit of land for hours, but in Breath of the Wild it would be awful. Imagine being in Central Hyrule and just hearing the Hyrule Field theme loops dozens of times. No matter the quality of the music, that'd start grating on me pretty quick.
But you are right, bombastic themes like we typically heard wouldn't have been thematically appropriate.