I don't agree with this. Like at all.
I believe there were like 3 types of CG in KH3:
- The good CG - The one you see most during the game, including the let it go scene. In these CG scenes there is a clear pop to the colors, sora's hair almost looks orange in some of them. And the clothes hava a rubbery feel to them.
- The great CG - That in my opinion are reserved to the Opening movie and Epilogue, in here it is clear that the animations (especially when they talk in the epilogue) are better and every material just looks better. Just compare the ammount of detail on one organization cloak:
In the axel one, the suit
almost looks smooth to the touch, in the Opening the suits have this scaly texture to them, like this:
These are the types of details that are missing in most CG cutscenes in KH3, and there is no problem with that due to the sheer ammount of CG cutscenes we had.
-The amazing CG - Only in the secret ending. This is the one that really feels on par with CG scenes present in FF or even past opening CG cutscenes. Like seriusly the ammount of detail in this scene is amazing, drops of water in sora's fingers, hair quality, light reflection and again material quality. I wish all scenes could have been like this, but budget is a thing, and they can't blow it off on CG scenes.
Now one can argue, that spending money on "Let it go" scene was unnecessary, and it might have been, but it's a neat thing to see be made honestly, and I'm glad they added it in.
So I dont agree with your sentiment. I didn't even think the scenes in Arendele looked all that impressive.