Are Organ gun useful?

They are replace Falconet in Portuguese.

Falconet can deal 100*3 = 300 against infantry, but Their damage are 33*6 = 198.

Falconet can deal 100*2 = 200 against building but Oragan gun can deal 33*6*0.75 = 148.5.

Falconet AOE is 3, but Organ guns AOE is 2.

They have lower hp so Culverin can kill just oneshot.

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So... I wonder they are useful, and If not why Ports have these units, lol.