It just has never been necessary for their evolution

Now Im sad they cant build

They also have a very complex communication system, but one that falls short of the base criteria for language. Wait'll they start using language; then shit's gonna get weird fast.

'Animal Scientists' your validity just went out of the window.

What defines it as "more advanced"?

So people born without arms.... they act like whales and just flop around and sing songs that only other armless people can understand?