Don't mean to make this all serious but sure you could talk about how god or a designer was just playing around or you could think about how the environment and the selective pressures were different during this period of the planet's history.
This befote the META became all about efficientely killing everything while wearing armor. This the ptelapsarian world before the spinal catastrophe.
After that point, you can't just "be yourself", you'll just get ganked. So everyone started putting all their point in attack and defense, variety massively got reduced and everyone became a servitor of Moloch while existing only so that the mindless universe could suffer the pain of its own entropy.