I just blended 1 banana with 3/4 its rind with an infusion of nettle. It is OK, it is different compared to no rind. I am not sure I'd do it always.
... I felt it was pity to throw the whole organic rind. Lol.
I believe, if I cut out the rind where it forms an edge on the sides the smoothie will not have bigger particles and will be smoother. Otherwise the taste is 4/5 if 5/5 is no rind blended. It has more earthy nuance to it.