My non-spoiler thoughts on Persona 5:
B) The final boss theme is surprisingly weak. It's not bad, but it pales in comparison to The Battle for Everyone's Souls and fog. It's a pretty straightforward track, and it really lacks power or finality.
I had to agree in this , since we talking of Shoji Meguro here the guy who throw "Rivers in the Desert" in this OST which to me is easily one of the best tracks in the series both instrumental and vocal , you can expect the final theme been something more epic / powerful
Like you say tracks like Battle Hymn of The Soul , Mist , Brahman (DDS) hell even the Final Batlle of Nocturne shows you how weak the final theme of P5 is , feels like a lost Persona 1 psp track since it loops after 45-50 seconds and one part is basically
P4 Genesis
And sounds likea regular Devil Survivor battle theme to me
Maybe when i played it , it will grow in me but now is maybe one of the weakest battle theme Meguro gives us so far.
Great review btw , game sounds great specially the bits about feels like DDS battle wise , since i love those games too much