Another note: All Vex are not actually meant for combat, they all have constructive purposes. I don’t remember where I heard it, but I know that in construction, Minotaurs do the heavy lifting, Hydras usually do multiple jobs at once, and Cyclopses act as beacons of some sort. Not sure about the others.
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I believe this is also supported by the public events and the first encounter in the Vault of Glass where you have to keep the vex from sacrificing themselves less they complete construction of the Conflux.
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I think they use their "guns" as welders.
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This is supported in the Grimoire entries on the Vex in D1.