In several stories regarding the Insecticons' nature and origins, the concept of "mutation" is often brought up. In IDW, the Insecticon Trio are the mutants; the odds of producing them were a 1000:1. In other continuities, the Big Three are the original Insecticons with the others being progressively-inferior clones. Whichever the case, mutation requires genetics of some sort, a baseline to make changes from. To paraphrase a Transformer-related article from "Popular Science" magazine, Transformers exhibit physical and behavioral diversity that's more akin to biological reproduction than simple construction. This is a field called evolutionary robotics. Instead of simply building a robot, the computer randomizes genetic algorithms within a set parameter to determine the robot's design. Simply put, it introduces diversity and mutation to the Transformer "gene pool". Why are some bots bigger; how can this one teleport while others can't? It's chance; chance and resources. It's a reasonable explanation as any, and would definitely explain why Transformer physiology is so consistent despite their varied forms. I believe that, more than other Cybertronians, Insecticons would be affected by this. Some of their traits are more analogous to organic life than mechanical, and this would be no exception. This, their diversified palette (G1 states they can consume both organic and non-organic material), beast-modes, universal repulsiveness on both sides and connections with Airachnid/Blackarachnia all lead my to assume that the Insecticons are techno-organic. A bit anti-climatic, isn't it? But hey, it's my first post.