A lalafell sleleton would look too creepy if they were a hoard mob
I.e like the slugs in WP
Also their bones must be really soft/ baby like due to their aging and structure lol.
Meaning 1 good ol stomp will kill em ^^
Imagine issac from deadspace stomping on lalafell necromorphs.

They probs just wanted to reuse the skeleton template they already had = less work