The less absolute (singleshot) damage a gun does the better greased becomes on it in comparison to charged. (Keeping all other values the same of course)
Incendiary firs reduces the dps and dpc of a gun, then only add a 20% chance to set 1 fire. An entire gatling clip as it is now would set an average of a little less than 13 fires (12,86) assuming all shots hit and the component hit is not immune to fire during the entire time (very unlikely since extinguishers now give immunity for 3 seconds and chemspray got buffed). The little benefit is really not worth the enormous disadvantage.
BUFF TEH INCENDIARY!!!!
Oh, and while you're going away from your nerf trip and are on the buff lane again awkm,
BUFF TEH CARRONADES!!!!
(5 replies were posted while I wrote this one, seriously guys, too many posts is a thing)