I miss the instrumental versions of Close in the Distance myself as well although I don't mind the Lyric Version playing in the background as it is a nice song by itself.

If SE would combine the Lyric Version with both instrumental parts the length of the song would be around 9:40 minutes. Over the course of a full day in Eorzea it would loop 7,5 times.

If SE can't let players switch between the various songs then this would make a good compromise in my opinion.