In all honesty, most players choose alternative weapons that will translate into builds for other expeditions or other build types, or simply because other weapon options are just better for output. It is difficult to use weapons like this due to its ammunition and reloading. For more consistent output you could simply just keep swinging a melee weapon and close your eyes. With a Blunderbluss you have many idle windows, and you do have to aim slightly. On top of this, it is difficult to use in Mutators at times due to rotating mutated effects that could drastically reduce Fire damage taken.