Speaking and communication are not the same thing. Yes all living beings communicate to each other but we are the only species that can speak. The fact we can speak is the reason we evolved past other animals. People speaking is the reason we can talk to each other right now on the internet. If humans couldn't talk we would be hairless monkeys living in caves. Speaking is the biggest evolutionary tool we ever got. Look into history of language and speech. Its actually insane what speaking did to us. At least we can write tho. That counts for something I guess