Benjamin Van Roy quotes:

Anomalocaridids seemed to lack front limbs, being an arthropod - being a joint-legged animal - and not having legs, it's kind of embarrassing.

The discovery informs about the origins and early evolution of arthropods, the most ubiquitous, species-rich, morphologically diverse and successful animal group on Earth.

Given the huge size of Aegirocassis and its very alien appearance, I assume most people would probably be terrified if they'd encounter it while swimming. However, contrary to almost all other anomalocaridids which were active predators, our animal would have been a very peaceful guy.