Okies, so here are screenshots...
Below is one original field with scaling uses (character size has
not been edited).
Following the original scale, even with chibis, many elements of this scene have an absurd size. The TV and the flowers are the most blatant example. A general character upscale (using Makou Reactor) may partly solve it, however some elements are not properly scaled when compared to each other (for instance, the lilies in the background are huge with respect to the table and the chairs).
Now, for proper comparison of various cases, I chose the colne_be3 scene. I picked this scene because I've completed my work on it, and I've done the "rescaling process" in doing so. This scene does not present many instances of the "scaling problem", though. I placed Cloud next to the boot because this is one particular object which went through rescaling revision.
First, let's have a look at the original field with original chibis:
As you can see, the size of the boot is a bit too big in comparison to Cloud's size.
Next, let's see my moded field, after fixing scaling issues, using the chibi model:
I believe the scale of the boot in my moded version is much more suitable than how it is in the original field, even when using chibi models.
Finally, let's see my moded field with Kaldarasha's (old) model of Cloud, which has more realistic proportions.
Obviously the scale is suitable, because I had taken this model to test the scale of the objects in my scene. In my opinion this is how the game is meant to look like.
All in all, I think realistic scale is more suitable than original scale, even with chibi models.
That's all folks
