Because their short range, and uncontrollable effects, limit them çuite a lot.
I was thinking that, if you built six or eight of them, you might win a bridge battle by simply placing them so that they range into the bridge path, and alternate the shooting so that it becomes a continuous fire. Some units of general spearmen might be useful to contain the initial waves, and then die gloriously in the organ gun´s salvoes, to increase the frag ratio, and maybe some arbalesters (or catapults) to fire at anyone attempting to snipe at your organ guns. This would allow for a very cheap defense force, but otherwise I see no use for them. Even in a typical bottleneck bridge battle (AKA: use a GOOD spear unit to hold a lot of enemies back and then shoot the hell out of them with arbalesters or bowmen) they´d do more harm than good, as they would likely kill off your troops as well as the enemy´s
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