Iv'e never ruined a cut with bark on.
Now I'm not throwing hunks of pure bark on the fire mind you, but if I get a box of cut up peach limbs (thanks nthole) or cherry chunks (thank Phil) with some bark on, it don't seem to matter much.
Someone down in AL was gonna send some maple (I think it was). Wouldn't hesitate to use it if there was some bark present :)
"Bitch..." - Jessie Pinkman
Bandera, M-BGE, WSM, Gold Kettle, Kenmore Gasser, 36Qt Turkey Fryer, ECB, Dutch Oven