Honestly I have no problem with the Destati and Rage Awakened refrains, those are the strongest parts of the piece and are indeed epic AF. The new melodies composed for it, however, don't seem to really go anywhere, and don't make much meaningful reference to existing motifs. For instance, 1:31-2:30 here is just... meh: https://downloads.khinsider.com/game-soundtracks/album/kingdom-hearts-iii-gamerip/194.%20Wielder%20of%20the%20Sky.mp3
It also seems to modulate (?? someone pls correct me if I'm wrong) from 2:08-2:30 to a brighter mode, which is kind of out of left field. Their choice of violin MIDI patch is also... not very good. In fact, does anyone know what percentage of tracks in this OST was recorded with live orchestration? Because this track is definitely not one of them.
Also, the track bears striking similarities to the Caribbean battle theme, rhythmically, melodically, and in its orchestration, so I have a hunch it was the same person arranging both. https://downloads.khinsider.com/game-soundtracks/album/kingdom-hearts-iii-gamerip/119.%20Thunderous%20Brine%20-%20High%20Seas%20%28Battle%29.mp3
All of which leads me to believe that they probably ran out of time/scope and sort of phoned it in on this arrangement. Not that it doesn't have some redeeming qualities! I don't hate it.