Language isn't just a communication skill. We use it to imagine complex concepts; monetary systems, nation states, moral codes. The fictitious ideas that are the foundation of society.
Language is a new fandangle way of articulating our thoughts. Regardless of whether anyone else reads it, we examine and inform our own opinion without swaying others. For example, determine that we dont really give a shit about a certain topic.
At some level that's universal. The billion year old subconscious spoon feed its conscious monke-mind answers and solutions because the new upstart called a self wouldn't know what to do without fandangle narratives of memes..
Why dream of my dead mother-in-law riding a tricked-out unicycle to metaphorically represent the best career path I've been stewing on?.. Just tell me which damn job to take stupid lizard brain! Maybe the concept in my dream is just closer to the truth of it all.