Language has evolved to be efficient though. If you try to send more information than a channel can handle (ie violate Shannon’s limit) you will not send the message across. Life is noisy. Just because language is inefficient in a quiet room doesn’t mean it isn’t useful to be able to communicate on a windy day. It’s possible that with the emergence of text based conversations and more quiet rooms that language is evolving to be less felt tolerant and more (what you would call) “efficient”.