Assuming an proper lighting, i would say and even burn line indicates a properly constructed cigar and consistent humidity of the tobaccos throughout. Burn line to me is important to have consistent flavor also. If you smoked short fillers based on scraps you know keeping a straight burn line is not easy. I tend to rotate while smoking to keep the "top" even As i write this the dpg 2018 15th anniversary has the ugliest ash that i could remember, in contrast to the very white ash of the 03 DD i smoked last week or any cc or nc ive smoked in the last couple months. Certainly an interesting a topic... looking forward to what others have to contribute here. Sent from my SM-G950U using Tapatalk