So, I love On Windy Meadows and I think it's more fitting than the current theme.

But.

No matter how good a song is, if it's BGM you hear every day it just becomes noise regardless.

Prime example is the Limsa theme:

https://www.youtube.com/watch?v=U7ForHMX-xs

Great song, very fitting for Limsa, but you wouldn't even know it at this point because you've heard it 5,000 times.