He may be from a civilization of super-geniuses, but he comes across as rather eccentric (typical of a megalomaniac) and I always considered the Prometheans his own personal design, hence the animalistic designs that were much different from other previously encountered Forerunner constructs (e.g., Sentinels and Monitors). He wants his forces to look threatening and intimidating. Aesthetics trumped practical necessity. Y'know, typical Hollywood supervillain shenanigans. Not very original, but then again the Didact, at least as he was portrayed in-game, was a very two-dimensional character defined almost solely by his hate-on for humanity.
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