The music in Final Fantasy XIV is pretty good in my opinion. From past topics like these, most of complaints are from the arrangement(i.e. too many rock songs), most of the songs feel out of place(i.e. Thanalan's overworld theme), and repetition(i.e listening to the same song on repeat without a break). But I think most of it comes from repetition, these zones are huge so you're hearing one song constantly. I agree with someone's option, add some day and night tracks or when it's nighttime don't have any music playing. That would help in the short term.

Now as for a future composer, they definitely should get Sakimoto Hitoshi over Mizuta. I don't think I could survive another folk music, woodwind based soundtrack again.