Doesn't this make the chest just a vehicle with hammer space and is entirely unnecessary beside you know for identity shake?

DammitCarl said in comment #2617683:

Doesn't this make the chest just a vehicle with hammer space and is entirely unnecessary beside you know for identity shake?

It could also be that Mimic's don't have a "true form" and are just a mass of flesh and the chest is used to contain it, otherwise it might dry out or get dirty. Basically just a shell to protect the squishy innards.

They can shape their mucus into fully functional bodies, but it seems like their chest and actual bodies can be changed too.