the furriness exists on a wholly superficial level
The superficiality is a hallmark; if you need your furry to have a point, then you're missing the point. "Allegorical weight" has been done; if there is an artistic statement being made by furries and furry art (and the creator of Blacksad, admittedly, is not really a part of the movement, but doing something similar outside of it), it is that furry characters do not need to be allegorical to be worthy of application to "adult" genres.
the furriness exists on a wholly superficial level
The superficiality is a hallmark; if you need your furry to have a point, then you're missing the point. "Allegorical weight" has been done; if there is an artistic statement being made by furries and furry art (and the creator of Blacksad, admittedly, is not really a part of the movement, but doing something similar outside of it), it is that furry characters do not need to be allegorical to be worthy of application to "adult" genres.